I have to agree with luvmy. DO you want to support this person? I wouldn't, and I sure would let them know what I thought about their treatment of the rats.

Will they be unhealthy? They will likely be dehydrated and who knows how often he feeds them. I wouldn't be surprised if they had parasites as well.

I would buy a small sterilite tub and set it up to hold rats. We have stickies in our feeder section, but this way, you can get the rats, feed and hydrate them for a few days, and feed them off or gas to ensure that you give your reptile a healthy meal.