Well if your great uncle knew where he is, it sounds like he should probably be a suspect…

…or he’s a really dedicated mailman making sure that shit got delivered. But he must still be looking, otherwise we probably would have heard.

EDIT: Obviously the guy collecting the mail is OPs great uncle and not the mailman, and I understand how the mail delivery works. Some of y’all are dense. The ‘ole Reddit switcharoo used to be easier…

The mail would have continued being delivered to his last registered address.

I never knew Jimmy Hoffa's middle name was Riddle. Very appropriate.

The guy in the pic is just grabbing the mail at Hoffa’s house. I assume his wife stayed there the caption says “the family home”. She didn’t realize he would never come back. So OP’s great uncle was just helping out. He was likely not secretly delivering it right to Jimmy. It’s thought that he was murdered right away not that he was in hiding.

If I were OP I would be definitely asking questions though. Or maybe not…

The guy in the mail truck looks like Bureau.....

My dad is a retired letter carrier, his post office delivered Ted Bundy’s remains to his mother in 1989.

It was his mother's maiden name. Also my grandmother's maiden name. Our common ancestor lived in the 1700s.