I received about 20 of these scam letters after buying a house. I kept all of them in a folder for my records. One thing that I noticed is that all these scam letters included a no-postage-required, Business Reply Mail envelope. I guess they make so much money off these scams that they can pay the return postage.
I returned all of these envelopes filled to the max with random pieces of junk paper. BUT, I made sure that my name and address (or zip code) did not appear in anything that I sent back. If I understand the USPS rates correctly (https://pe.usps.com/text/dmm300/Notice123.htm), each returned mail costs them $1.38. Maybe if enough people sent these envelopes back (with junk), the low hit rate compared to cost of the returned letters would make this business unprofitable.
I returned all of these envelopes filled to the max with random pieces of junk paper. BUT, I made sure that my name and address (or zip code) did not appear in anything that I sent back. If I understand the USPS rates correctly (https://pe.usps.com/text/dmm300/Notice123.htm), each returned mail costs them $1.38. Maybe if enough people sent these envelopes back (with junk), the low hit rate compared to cost of the returned letters would make this business unprofitable.