Proof of volunteer work?

I heard that UC schools do verification checks after acceptance with a random pool of applicants and I’m kind of nervous because I don’t think I’ll be able to provide proof of some of the volunteer work I’ve done. Back in 9th grade, I volunteered at my local library over the summer for a month. I logged in about 32 hours there but I have no proof of it. This was a little over 3 years ago and the librarian that was there at that time doesn’t work there anymore and the place doesn’t keep track of volunteer hours. If I was asked to provide verification, what should I do?

Cross that bridge when you get to it. But I highly doubt that they will ask verification of 32 hours.