Based on picture number three I have to agree. I got a surprise litter after buying a rabbit a few years ago and that's what they looked like after a few days. Domestic rabbits are almost all pink when born. I don't know if this applies to all breeds though.
If these guys were not in a nest they may have been a second litter. A female rabbit can become pregnant again within a few days of giving birth. If she already has an established litter at the time, the second will be abandoned.
Chris