I used to get all kinds of goodies back in the day (2006'ish or 2007'ish to late 2008) in the mail via USPS.
I even had a PO Box where I had it all shipped to.
Now, years later, I realize even though I thought I knew it all I really didn't. I was young, dumb, and looking for drugs.
Getting illegal drugs shipped to FEDERAL PROPERTY (post office) was stupid.
Either way, I'd say the best bet is to consider it lost and don't even claim it or say it was yours. Deny or just refuse comment.
I prefer refusing comment apart from the easy way to deny by saying: "What?!?"
You don't know anything about that shit.
Might be good to clue in the family that some shit happened that you can't explain, but because you love them they need to refuse or deny such and such for protection because you were a dumbass, but it's nothing to worry over.
I just can't believe all of the shit I got delivered with no issue over several years to the post office box I had.
Maybe they/somebody knew, but because it was all personal use amounts they were like "OK buddy. Have fun but get it out of your system we have only so much patience."
All I know is that I DO NOT send anything illegal or sketchy in the mail these days.