Keys anyone!?

Returned home to tonight to find this envelope- empty. Should have had keys to our friend's place- it was chewed and empty.
Thing is- we did find a set of keys around the flat- they aren't the ones from
This envelope!
Typical mess from Pepper greeted us- clothes and bedding relocated, even the oven mitt had made its way off the fridge and into the lounge.......who knows what we will find in the big cleanup!