Ugh. Some people are just awful. So glad these two sweet pups have someone pulling for them.
Another option, if you ever get close enough to whomever has the dogs, is offer $20 for each, have someone with you to watch the transaction, and walk away with them. That makes them yours through a business transaction. It's safer if you get them to sign something, but they probably won't. You can then relinquish them if you need to, to a no-kill shelter, which is better than what is probably facing them.
I do hope they are okay, and you are wonderful to care about them.