These guys mailed me an official looking postcard, but as far as I can tell they are not official UCR. And I bet they sell UCR renewal service at a padded price. https://tx.payucr.us/ I went thru my state DMV, Texas, and their website put me in https://www.ucr.gov/ where I paid $59 God bless Texas, and damn the scammers.
There are bunches of scammers out there. A lot of them try to scare you and sound official.
I've gotten very official looking letters from domain "listing" services. They try to make you think they are "hosting" your domain (website) and you will lose it if you don't pay them to list it on their site. Sorry Charlie, we only want tuna that tastes good. Ed
I get emails all the time. Just a third party company trying to charge you 3 times more than what you can do yourself.