They should be fine if you can't find anybody. Of course, it would be better if they had somebody to check their water and their poop, but it wouldn't necessarily hurt them. I would be more worried about their heat failing while you're gone and you come back and they all get sick due to the temps. Find somebody if you can, but 4-5 nights isn't all that bad. What you can do to help reduce the likelihood of them pooping while you're gone is to skip the feeding before you leave, that way there's nothing digesting. Will somebody probably still poop regardless? Yes. But then you're also not risking leaving a half-digested rat in there if one regurgitates.
In short: they would be okay, but it would be better to find somebody that can check on them at least once while you're gone.