I adore having my pet rats but I get them when they're young. Never adopted adults before. I have cared for someone's rats while he was on vacation. They were a bit shy the first couple of days but they warmed up to me quite quickly with hand-held treats. I guess it would depend on how much handling they received from their previous owners. Our rats are comfortable being held by anyone that comes to visit. Then again, we let them out about an hour a day to run in the living room and play. We wrestle and play peek-a-boo with them under a small blanket. Yeah, I know this all sounds weird but it's fun for us all. If we just sit still, they get annoyed and crawl up to our face and lick as if to say - hey, move it! Just take your time with the new pets, watch their reactions. The last thing you want is a rat bite. Ouch!
I just noticed that you said the rats were 2 years old. That's getting old and they've probably slowed down quite a bit. That will help.
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