Can you give your opinion as to whether "Finders Keepers" applies in this example of a lost wedding ring?

My coworker came to work the other day and said he got an MRI over the weekend and left his wedding ring in the dressing area of the MRI place, and someone took it. He called when he realized (at home) that his wedding ring was left, and they could not locate it. The manager of the MRI place called him to offer condolences, and he asked if they could contact the two other patients who had MRI’s that day. The MRI place said no. He understands that he could not get their names, for obvious reasons about privacy, but he wanted the MRI staff to contact the other two patients and ask if they have it. He said he would offer a reward of $100. The MRI place is not doing that so it’s probably in the hands of a new owner. He and I were discussing what the ring is worth and if it would benefit the new owner to hock it.

I told him that the gold in the ring was probably worth more than $100. It might be beneficial for the person to keep it.

We then had a friendly debate:

He feels that if someone took the ring and received a phone call asking if they had it, their conscience and concern about getting caught would lead them to return the ring. I feel that the person who has the ring should not fear getting caught, as they did nothing wrong. Finders Keepers. I feel that for them, it may be easier to keep the ring and not admit it. He feels that whoever took it “stole it” and should be afraid of getting caught.

He said it was not the person’s property and if they took something from the doctor’s office, it is stealing. I said unless it’s clearly the doctor’s property, such as on doctor’s desk, file area, etc. it’s one thing but on the floor of a dressing area (presumably) it’s not stealing.

He feels that if they “stole it” and receive a call asking if they have it, it will scare them and make them paranoid, and they’ll want to return it.

What do my fellow Jellies think?