I took some vases without asking permission

Question:

I was out walking a few months ago in an area I don't normally live. One of the neighbors was selling their home and moving to a new home. They started to trash stuff and there were two beautiful vases that I admired so much. One day I took the vases thinking that they didn’t want them because I thought that they add completely left the resident. A couple of days later they came back and started to trash more stuff, but by then I had sent the vases home with my husband. I started to feel guilty. I told the person I was staying with that I was going to return them, but she said it was too late because they were going to think she stole them. Anyway, I let it go, but now that I have rededicated my life to the Lord it makes me still feel guilty; even though I know that I am forgiven, I still feel guilty. I don’t know where these people move to, so what can I do to release my guilt? Should I keep the items or trash them?