No, I would not. My conscious would override my
greed and "Id".

If I knew the owner of the cel then I`d tell
him/her where the stolen cel was, out of respect
for the property involved. I would however allow
myself to make a reasonable offer to the original
owner for the cel, a bit before I turned-in the
thief ^-^

If refused, then that would be just too bad. It
means that it wasn`t meant to be mine in the first
place. Holding on to it, knowing that it is
spoiled, rotten, cursed goods, is not satisfying
at all, IMO.
(...maybe not "cursed"...hehe)
E