I was setting up a pet for an auction I had been running, however I accidentally pressed "change price" before putting in an id. Beforei i coul click again someone managed to snag it. I have message this person several times politely explaining and asking for a return of my pet. Is there anything I can do should this person refuse?

You could tell Krin, I don't know what he can do, but I bet he could try to help you.