Do I have to give this item back when they don't ask for anything else?

We moved into a rental and owner claimed they would clean out stuff left unwanted by other family members. This was never done. There was a china hutch and for 2 years while I lived in the house it was used and housed my china. One of the grandkids said I could have the piece and saw I was using it and never said a thing. This grandchild is now the manager and now that I am moving they said it is theirs and they want it back. I removed other items while living in the home that were considered junk (old couches and rugs). Nothing was stated about the furniture left behind in the rental contract.