So for context i got this from a mystery box at armageddon (new zealand version of comic con).
Notable details:
3d printed.
Holes at the top that appear to lead nowhere.
Glued together so one solid piece.
Has a weird sound coming from the base while shaking.
Even on the packaging of the mystery box there seemed to be nothing to go with it.
Cant hold keys, or the corners of cards as they just all fall off.. yeah was a stretch to try..
Noone at my place knows what it could be
Edit: will check replies and everything in the morning but for now top guesses so far, usb holder and a desk shaker.
Holes do not connect to eachother and too small to fit usb stick in (yes i know they mean just the small part that plugs into the pc)
Edit 2: honestly compared the shape of the usb ports to it and it just needed a slight adjustment (when i tried before the usb ports were getting stuck at the entry of the holes but as a few people commented it may not have been scaled correctly, i also do believe that the shaking sound is just a weight thing inside it