LHBS sells dry yeast off the shelf, liquid yeast from a fridge. I've never had any trouble with either. I wouldn't worry about it unless they're real old or got real hot.
Having said that, moving trucks can get REAL hot. I've seen plastics melt during moves in summer. If by ambient temps you mean moved in a truck, it may be worth doing a starter with one to test, and if it goes OK, I'd just pitch the rest as if nothing happened. If the starter fails, I'd just toss them all. If you just mean they got left out after the move, then don't sweat it.