What items have you forgotten when you left for the winter?

Somebody mentioned blank checks.

I didn't bring enough last year. I thought, who is going to want an out of state check? Turns out, a lot of people. But I learned that many more service folks (medical, etc.) will take paypal than I imagined.

And that if I leave things (e.g. checks) in a locked box I should leave the KEY with someone, too ;).