Curious about this so investigate the Sandy Grounds, particularly to see anything has been buried here
You invoke the power of darklight by taking a cool torch from the Dark Lab in your hand and clicking it a few times until it works. A purpley-rainbow light erupts from the end. The claw marks are physical, and they're real, and it looks like they react gently under darklight.
You note that the Armory check from before was only focused on weapons, and spot some armor missing as well. Unlike the weapons, it's easier to tell at a glance which specific pieces have been taken. A whole suit of leather armor is gone, and a few pauldrons from a heavier suit as well.
There are a few animal skulls in the rafters, with modern skulls grouped with the Safari Exhibit items and more ancient skulls grouped with Ice Age Exhibit items. You note that it definitely seems like a collection of adolescent wooly mammoth bones, a mixture of replicas and real ones, is missing an obvious skull.
You unearth a horse skull from the Safari collection, and try to carry it around. It's heavy, very noticeable, and kinda gnarly. Under a tarp, it would be more unassuming, but still very noticeable.
You trek through to the border between the sandy grounds and snowy grounds, and start digging a hole roughly near the border. As all great adventurers are wont to do. The wind blows the sands and dusts around you, and it's coarse and rough and gets everywhere. You find sand. You keep digging, and you find nothing but yet more sand. Perhaps it's in a slightly different spot? You dig around some more. Alas... sand.
There isn't another present, so you can't compare the impact exactly. KBB also lacks a closet full of woolly mammoth skulls, so you make do with a replica elephant skull with small tusks. A replica mammoth skull would be hefty, but if you were prepared, you could reasonably strike someone from behind with this, and leave a gnarly bruise.