I hate to be "that guy" but quantum mechanics does not imply other possibilities.
It does not make sense to apply quantum mechanics to the macroscopic world. Most of what you hear about quantum mechanics is just talk and falls more under the realm of "speculation" since we still don't fully understand many of the implications, many of which are likely just mathematical curiosities and don't exist in the real world (or at least in the macroscopic world).
Also, and owing to the fact that I'm a Copenhagen Interpretation kind of guy, I believe that act of finding, or seeing, said unaccounted for tin would cause the various wave states of the tin to collapse to the outcome of the tin being where you are seeing it.