I'm not convinced the 'hidden keys' in the images will help with the overall solution. The 'hidden hares' in Masquerade were for fun, and I feel the keys in the images of Fandango are much the same. They are just fun to find.
Now I do feel the 'actual keys' on the collage page (Page 11:A Measure of Gold) hint to items. But they are definitely not hidden and are not subjective.
(and I should also say, I'm not convinced they don't mean anything either...lol)
All options open....
Thanks for sharing the 'key finds'.
What do you all lean towards? Fun finds or hints to something?