I would have an OASIS report pulled for it. There are some members here who can do it for you, but do not openly advertise. PM me and I can FWD the info to them for you....
The OASIS report is the Ford internal database which shows any service performed at a dealership, as well as the complete build for the vehicle. Because the truck has very low mileage, my guess is the previous owner(s) likely had the truck serviced at the dealership if it needed it. The OASIS report will show this, not to mention mileage.
If you are buying the truck from a dealer, it would be pretty hard to believe that the dealer is pulling a fast one on you with the mileage....they likely did their research before buying the vehicle from auction or a trade in, and advertising it with that low mileage without verifying it. If not, there is an easy lawsuit...and in this day and age with the dealers, I doubt they would want that.
With that said, the interior cracking is likely because the truck sat outside with the windows up in the heat, the interior was not cared for properly, and thus...it looks older inside than it should. I have an '03 and my interior is mint....because it was cared for by myself and also the previous owner, I also have 130k miles and you wouldn't know it by looking at the inside.
If you're buying this from a MAZDA dealer they will not be able to help you with the OASIS report, it has to come from a ford dealership....and Ford doesn't just hand them out to anyone who walks into their service dept....you have to have a connection for it.