No temporary plates in MS. I bought the car in alabama
(cobra) and drove it home with no tags. Ordered my vanity plate and got it a few weeks later. In the mean time you get to explain to every officer why you have no plate.
On the 90, first day I owned it got pulled over 3 times for no tag. Cops are persistent at least. Same deal, vanity plate, took 3-4 weeks to arrive at the house.
Luckily, on the focus, we just transferred tag from an existing vehicle, and since it was bought in TN we had a paper tag. New thing for me...