Late 19th Century British Military Dispatch Box

"Somewhere in the vaults of the bank of Cox and Co., at Charing Cross, there is a travel-worn and battered tin dispatch-box with my name, John H. Watson, M.D., Late Indian Army, painted upon the lid. It is crammed with papers, nearly all of which are records of cases to illustrate the curious problems which Mr. Sherlock Holmes had at various times to examine." (THOR)

Unfortunately, Cox & Co. was destroyed in the World War II bombings of London by Germany; and the archives of Dr. Watson are assumed to have been lost forever.

Following is a list of the known topics of Watson's Unpublished Writings & Holmes' Unpublished Cases (of which, there were thousands):

The references to the following cases all occur in Dr. Watson's writings; but he was not present for all of them as some occurred before his association with Mr. Holmes. Therefore, they have been grouped chronologically (but not ordered within the group), where indicated. In many instances, details regarding these cases are not forthcoming, so educated guesses have been made (with regards to where other scholars have placed published cases in chronological timelines and how unpublished cases chronologically relate to published cases).

Pre-Watson

Record of the Tarlington Murders (MUSG)
The Singular Affair of the Aluminum Crutch (MUSG)
The Old Russian Woman (MUSG)
Ricoletti of the Club Foot and his Abominable Wife (MUSG)
The Case of Vamberry, the Wine Merchant (MUSG)
Mrs. Farintosh and the Opal Tiara (SPEC)

During Watson's Tenure With Holmes

The Camberwell Poisoning Case (involving Holmes winding a dead man's watch) (FIVE)
The Case of Colonel Warburton's Madness (ENGI)
The Adventure of the Tired Captain (NAVA)
The Adventure of the Amateur Mendicant Society (FIVE)
The Singular Adventure of the Grice Patersons in the Island of Uffa (FIVE)
The Adventure of the Paradol Chamber (FIVE)
The Facts Connected with the Loss of the British Barque Sophy Anderson (FIVE)
The Famous Card Scandal of the Nonpariel Club Involving the Atrocious Conduct of Colonel Upwood (HOUN)
The Case of the Unfortunate Mme. Montpensier Regarding the Murder of her Step-Daughter, Mlle Carère (HOUN)
Wilson, the Notorious Canary-Trainer (BLAC)
The Sudden Death of Cardinal Tosca (BLAC)
The Tragedy of Woodman's Lee (BLAC)
The Affair of the Dutch Steamship Friesland (NORW)
The Case of the Papers of Ex-President Murillo (NORW)
The Abergavenny Murder (PRIO)
Case of the Ferrers Documents (PRIO)
The Case of the King of Scandanavia (NOBL)
The Little Problem of the Grosvenor Square Furniture Van (NOBL)
Huret, The Boulevard Assassin (Which Won Holmes an Autograph Letter of Thanks from the French President and the Order of the Legion of Honour) (GOLD)
The Dundas Separation Case (Hurling False Teeth at Wife) (IDEN)
The Repulsive Case of the Red Leech and The Terrible Death of Crosby the Banker (GOLD)
Addleton Tragedy [and the Singular Contents of the Ancient British Barrow] (GOLD)
Smith-Mortimer Succession Case (GOLD)
The Peculiar Persecution of John Vincent Harden (SOLI)
The Case of Archie Stamford, The Forger (SOLI)
The Case of The Politician, The Lighthouse, and The Trained Cormorant (VEIL)
The Little Affair of the Vatican Cameos (HOUN)
Henry Staunton, who Holmes helped Hang (MISS)
The Case of the Two Coptic Patriarchs (RETI)
The Black Pearl of the Borgias (SIXN)
The Conk-Singleton Forgery Case (SIXN)
The Case of Isadora Persano and The Remarkable Worm Said to be Unknown to Science (THOR)
The Case of James Phillimore (SIXN)
The Cutter Alicia (Which Never Emerged from a Small Patch of Mist) (SIXN)
Major Prendergast and the Tankersville Club Scandal (FIVE)
The Woman at Margate with No Powder on Her Nose (SECO)
The Dreadful Business of the Abernetty Family (Holmes Used the Depth Which the Parsley had Sunk into the Butter) (SIXN)
The Bogus Laundry Affair (with assistance from Lestrade & Aldridge) (CARD)
The Second Stain with Monsieur Dubuque (of the Paris Police) and Fritz von Waldbaum (a well-known "specialist" of Dantzig) (NAVA)
The Mortal Terror of old Abrahams (LAST)
Bert Stevens, the mild-mannered murderer (who wanted Holmes and Watson to get him off in 1887) (NORW)
The Bishopgate jewel case (SIGN) (Holmes lectured Scotland Yard on it regarding causes, inferences, and effects) (Because SIGN occurred in 1888 - a date most scholars agree on, the Bishopgate case would have likely occurred within a few years -- thus being during Watson's tenure with Holmes)
Count Von und Zu Grafenstein (LAST) (Saved from murder by Nihilist Klopman). (By the same reasoning for placement of the Bishopsgate Case)
The Darlington substitution scandal (SCAN) (By the same reasoning for placement of the Bishopsgate Case)
Arnsworth Castle Case (SCAN) (By the same reasoning for placement of the Bishopsgate Case)
The dramatic introduction of Dr. Moore Agar (DEVI)
Merridew of abominable memory (EMPT)
Morgan the poisoner (EMPT)
The Manor House case (in which Adams was the culprit) (GREE)
The most repellent man of my acquaintance (a philanthropist who has spent nearly a quarter of a million upon the London poor) (SIGN)
The most winning woman (hanged for poisoning three little children for their insurance-money) (SIGN)
Services (to the Crown, most likely) for which Holmes refused a knighthood (3GAR)

Likely during Holmes' and Watson's Friendship but without Watson [Perhaps during marriage(s)] or other absences by Watson:

Blackmailing one of the most revered names in England (HOUN) (This was the reason Holmes gave for not being able to go to Dartmoor so Watson would have known of this case but would not have been able to chronicle the final steps of it as he, himself, had been sent to Dartmoor in Holmes' place).
The Tragedy of the Atkinson Brothers at Trincomalee (SCAN)
The Case of the Trepoff Murder in Odessa (SCAN)
The Delicate Mission for the Reigning Family of Holland (SCAN)
The giant rat of Sumatra which involved the ship the Matilda Briggs (for which the world is not yet ready to hear) (SUSS)
The Question of the Netherland-Sumatra Co. and of the Colossal Schemes of Baron Maupertuis (REIG)
The French Government Matter of Supreme Importance (FINA)
The Case where he was of Assistance to the Royal Family of Scandanavia (FINA)
Matthews (who knocked out Holmes' left canine in the waiting-room at Charing Cross) (EMPT)
A Commission from the Sultan of Turkey (which called for immediate action, as political
consequences of the gravest kind might arise from its neglect) (BLAN)

UNCLEAR

Vanderbilt and the Yeggman (SUSS)
Venomous lizard or gila (SUSS)
Vigor, the Hammersmith wonder (SUSS)
Vittoria, the circus belle (SUSS)