A New Postal Privacy Product

The idea is basically to use indirection to hide physical addresses. You would get a random number to give to your correspondents, and the post office would use that number to determine your real address. No security against government surveillance, but potentially valuable nonetheless.
Here are a bunch of documents.
I honestly have no idea what's going on. It seems to be something the US government is considering, but it was not proposed by the US Postal Service. This guy is proposing the service.