I recently came across something interesting in the postal codes related to the Business Reply Mail - those prepaid return envelopes.
In decades past, you used to be able to tape those to a brick and cost the permit holders large sums of money on the delivery. The post office, some while back, added some phrasing to their codes to permit the discarding of “obviously nonsense.”
But. Those same codes require the delivery of “sealed mail pieces.”
https://pe.usps.com/text/dmm300/505.htm
So, by my reading, attaching these bits of nuisance to sealed packages up to either 13oz or 5lb, will cost them quite a bit more.
However, I believe the postal service can still get rid of stuff it deems unreasonable.
I do believe I’ll ship some hand mined basalt to a few of my less favorite spammers…