Sounds like my foster hamsters. Junior is becoming more friendly but often shuts his eyes in fear. If I hadn't had my first foster hamster from a different background I would have assumed hamsters were nervous animals, but the first foster hamster that was rehomed was very confident and friendly.
ARC has another 8 to 10 hamsters coming in from the same place, 17 in total. I read he has done this with mice too. Buys them, they breed, then he can't cope and hands them over to a small rescue in Wales, who then transports them up to ARC as they have a better chance of being rehomed in London. The rescues are considering taking action against him. He cannot keep getting animals, letting them breed then hand them over to rescues.