hemloc
Member
As a former USPS letter carrier and a current federal agent, I can tell you, with stupendously great and awesome authority, that it is definitely a crime to withhold mail belonging to someone else(And in some extreme cases has been prosecuted quite successfully!). You simply need to return it to the carrier and say 'no live here'(Always my favorite:lookaroun!). Don't just dump it in a mailbox, because it will probably get sent right back to you. If it's bulk/standard mail it will just be discarded by the postal service, unless it has something like 'Return Service Requested' or 'Address Service Requested'. If it's first class, it will be forwarded(if a forwarding order had been put in within the last year or so) or returned to the sender. Most likely, it will not be forwarded in this case, so she'll never get the PIN code and you can live happily ever after knowing that you saved her from the inevitable dire straits!