Hi everyone, wondering if someone could help me?

I've been asked to adopt a Leopard Gecko who currently is an unwanted gift my friend bought for her boyfriend. I have a spare tank, heat mat and plenty of crickets for when I can pick him up but unfortunately can't collect him until Sunday. He is now apparently living in a shoebox on some woodchips with no heat mat. Do you think he'll be OK in that state? Is there anything I should tell her to do in the meantime apart from to keep him warm and with a water dish? He's a male, 5 inches long and hasn't been fed since yesterday.

I feel real sorry for the little guy, hope he's OK..