#(anyway there's at least 1 prop key floating around but I've only ever seen a non-functional key prop for sale i.e no moving parts to that)

[harrietvane]

So, you can buy one of the books from the 1999 The Mummy at the upcoming March 2024 Propstore auction.

From the listing for Lot #250:

The heavy book is primarily made of resin finished in gold paint to resemble solid gold, and features several intentionally tarnished bronze components. The book's embellished metal spine displays 12 individual strands attached to each internal page. Designed to hold the front cover in place, four metal vulture-like clasps are inserted into the scarab emblems and are adjoined to uniquely designed hinges. Located within the book are 12 resin tablet pages covered in ornate hieroglyph detailing. To open the book, the circular mechanical emblem on the cover must be twisted in an anticlockwise direction, which causes the two clasps on the right side to pop up. To close the book, the two clasps should be pushed down into their corresponding slots and held. The emblem should then be turned clockwise, causing the locks to fix back into place. Intentionally distressed for the production, there are some small chips on the cover. Dimensions: 14.5" x 14.5" x 4.75" (37 cm x 37 cm x 12 cm) Estimate: $50,000 - 100,000

The clasps and lock mechanism are fully functional. BYO key, though.