The Raffles Relics Wikipedia
The Raffles Relics is a short story by Ernest William Hornung featuring A.J. Raffles a gentleman thief in late Victorian Britain. It was featured in the 1905 collection A Thief in the Night.
After being exposed as a thief, Raffles and his friend Bunny Manders are living in seclusion in Ham, Surrey. When Raffles hears of a display of his tools, and other artefacts related to him, at Scotland Yard's Black Room, he decides he has to take a look. Once there, having convinced the security that he is just an innocent member of the public, he is unable to resist stealing back many of his possessions as a memento.
The book ends with Raffles volunteering to fight in the Second Boer War which has just broken out.