Thank you all for your input!
@Tom, wow, 5 years! At least they return it.
@Covis, I will not hold my breath on the reply for the USPS, probably they will wash their hands saying that it shows was delivered...
@Danno, I'm looking into the Postal Inspector, and the link will send me to the USPS, when I select Mail Theft, it show up another scroll down window, and on the list there is nothing that can apply to my item.
Here the list:
The one that could be close is Precious Metal.
Thanks again guys!