I got one of these last week and almost lazily put it on the to-be-paid pile until I realized that I had a memory of paying for it already on the USPTO site, an

I got one of these last week and almost lazily put it on the to-be-paid pile until I realized that I had a memory of paying for it already on the USPTO site, and double checked. They made it seem old school enough that it could have been a government letter.