That's actually not odd at all, and doesn't fall on the DMV. I checked and Florida has an odometer exeption for vehicles which are 10 years or older. This means that after 10 years, the odometer readings are no longer significant. I believe a lot of states have this exemption. This is a buyer beware kind of thing for anyone who is looking to purchase a vehicle 10 years old or older.
It's good to see that you're around what 450k miles on a 99. That's not bad at all.