I got in contact with the CA BOE office. I found them to be quite friendly and helpful. I also was able to verify that I do not have to pay that much in taxes. It turns out that there was a mix up that caused a bunch of similar letters getting sent out. This has since been fixed and my confirmation letter should be arriving any time.
I would like to some day get sales up to or beyond that point consistently though. With sales like that it would mean so nice checks for the authors.