So they unplugged it... and then didn't plug it back in, right? Because a freezer should be fine for an hour unplugged.

I'd never unplug ANYTHING in someone's house. Never know when it might be something that will reset and need to be reprogrammed in these days. Inconsiderate and you should be telling them they owe you for the rodents. If I did something like that accidentally, I would offer to pay if I was told about it.