i has bought a house at the auction, the previour owner

has move out , however 2 day before auction day some one move in , now that he want 5000 dollars for moving expensive, he also said that some realtor rent this house to him, he doesn’t want to release reator name. what can i do

start an eviction right away.

Exactly. Either evict, or pay him cash for keys. Bummer situation, but nothing else you can legally do.