Yea, returning it would be an ethical thing to do. You will find most Radio Shacks stamp your receipt not returnable. They know the deal....If you know the exact area buy a detector from radioshack for cheap.
Might even be able to return it after using it.
Well sense I live only 20 min from asheville I contacted steven to see if he had found the ring or had anyone to help him. He said no so I got a friend to ride with me and we met up with steven then took a ride up onto the blue ridge parkway to where the ring was lost. After about 30 min of hunting we finally found it. So my $30 radio shack discovery 1000 paied off. It was an interesting trip to say the least.
Was glad that I could help out.