The trap has been checked (not by me, you couldn't pay me to deal with it, I do not fuck with mythical beasties) twice. And both times the food was eaten, the trap was triggered . . . and nothing was in the trap.
Our nice handiworker man maintains that we have an entire family of squirrels up there, but I know it's a griffin, and the trap is too small, and she's wily. You can almost hear her through the air vents, chuckling.