Or,  making "plaster" casts of petrified people cavities is not uncommon?   It may be that the hand has been artistically  smoothed. ⁰

Hi I agree with you, but there is a difference between several thousand years and millions of years! Isn't that true !!! If we assume that the hand is actually are fossil.

I immediately  thought of Pompeii and bodies encased in hot ash.  Pompeii  can't be unique.

No, I bought them from a friend.