I cannot vouch for the integrity of this video: although, heck, it was taken by security cameras in an office, so how could it be fake?
We have one of these elves for our tree, passed on to me by my Grammy. I don’t know how old it is, but I suspect it must be part of the first generation of Elf on the Shelf. He’s been on our Christmas tree every year for 40 years, and we’ve never caught him moving about. His descendants seem to be less cautious.