The vehicle the thread is centred on is most certainly not a 1981 vehicle, and isn't even likely to be from 1984 - that would make it one of the earliest 90s (that's what type it certainly is) and the likelihood of it surviving is small. This vehicle is wearing a false ID and should be kept at arms length. Ringing (UK term for falsifying vehicle identity) is pretty serious here, and given how seriously car theft is treated in the US, is probably even more heavily punished than in the UK.
As for it looking solid, a respray can hide anything (except the vehicle type mismatch). Given the deceit about its identity, do yoy really think the owner will be on the level about its condition?
With reference to the condition of MoD vehicles, while they were very well treated by the mechanics, with extremely thorough servicing and no-money-spared repairs, British Army vehicles were badly abused by squaddies and RM vehicles tend to have been waded in sea water. It's the RAF vehicles which tend to have had a cushy life pottering around flat airfields, getting the pampering by the mechanics and living in a hangar whenever not being driven.