When we moved into this house (in the woods) my son said he saw a mouse in the kitchen. We didn't so accused him of being squiffy and seeing things. That was 6 months ago. Now this weekend my son gleefully pointed out a tiny mouse floating dead in a bucket of water in the garden. We all went aaahhh poor thing - just wanted a drink and drowned.
Until later when my hubby gave me a kit kat which had been on the,mostly unused, dining table for a couple of days. I instantly saw it had been substantially nibbled on. I looked on the table and sure enough tiny bits of silver paper and a few bits of mouse poo.
So I think he gorged on the choccy, staggered out thru the french doors (usually open) gagging for a drink and fell in, too full to do anything about it.
Get a few bars in and see how you get on.