Hello Clair,
Was the drivers seat leather ?
As the vehicle sits quite high the the kerb, and most Japanese drivers are quite short the squab can incur quite a lot of wear with ingress and egress.
Bit if the leather is 'just cracking' it should be able to be refurbished at reasonable cost.
If the vehicle was clocked in Japan you will never know; but it is just not consistent with Japanese culture.
The Auction Sheet is, imho, the acid test. You must insist on a copy.
There are also BIMTA certification and CarVX reports regarding 'mileage'.
Most imports have their speedometer and odometer converted to miles from km.
The technique does offer the opportunity for clocking, not that I am accusing anyone of such activity.