wow, that's actually a thing. has it been challenged in court? it's claiming that the correspondence is "abandoned" because you received it so long ago, which is beyond ridiculous.
oh yeah, these letters i got over the past ten years? yeah even though i keep them all in this safe and every day i check on the safe and sometimes go through old ones, anything over 180 days is "abandoned" and sure, go rifling through it, it's cool
good news is i think it would have broad bi partisan support to fix this loophole. still, it's been around for decades.