Logan followed a lead all the way to London, and made a fantastic breakthrough: https://twitter.com/LoganoZaccaria/status/1199626722204934144
The fingerpost found on Beechey Island was definitely at the former Royal United Services Museum for maybe two-thirds of the 20th Century. Logan thought he could see it in the photograph above, but how to prove it? Well, it involved a lot of hard work in the RUSI Library, which he detailed in a long post for the Remembering the Franklin Expedition history club over on Facebook.
The clincher jumped out at him, magic-eye style, after weeks of studying the photo. That’s the Beechey Island anvil, right next to the post.