Dump the metal detector and cut through the stinky stuff to the real question..if you don't return the bling will the big guy above get mad and press the down button.
The morality issue again, and I seriously don't think any diety with enough umph to create every thing really cares what you do with your found bling.
Rather, I think any power with the ability to let me take a tiny electronic comb, use it to comb through the first few inches of dirt on a planet with billions of tons of the stuff, and find a tiny piece of bling, had greater things in mind than my condemnation for keeping it.
Likewise, if I found the bling in the yard of a bawdy house after a night of drinking, cussing, fighting and other lacivious conduct I wouldn't expect a host of sparkly winged creatures to appear and begin serenading me with their harps for
attempting to return it.
I'm not Catholic so it would be very impartial of me to go into a confession booth in my local cathedral, make sure there was no one else present, and ask if I should return the bling.
Probably the only sound I would hear would be MY own conscience talking because the big guy is too busy pushing down buttons at the bawdy house to morally judge me adversely for whatever I chose to do with a piece of bling, regardless of it's earthly value.
And, lest we forget the people who found $30,000.00 in a couch purchased at Goodwill, traced it back to the lady who donated
the old couch to Goodwill and recieved a whopping $100.00
for their benevolence.
I only wish I was afforded a set of circumstances which required my decision to keep or return a piece of lavish bling.....the only thing certain about my decision is you certainly would never read about it on this forum!