Oh man, my buddy got hit with this exact thing last year at a museum out west. He spent a whole afternoon sketching this raptor skeleton for a class, only to find out later that like half the thing was plaster and the real bones came from two spots miles apart. He was so heated lol, said he felt like he'd been drawing a sculpture instead of a fossil. The part that got him was nobody lied exactly, the info was just sitting in some footnote he never would've found on his own. So yeah @tyler368, once you see it as a guess, it's kinda hard to unsee it, and now he checks the mount notes before he even pulls out his sketchbook.