Looking at your other thread on the type of Moke you are considering (or at least the type people are suggesting) it seems like you are prepared to spend enough money to hopefully avoid the usual Blue Slip defect fails of rust, poor brakes, worn suspension etc, although you need to be careful that you don't end up with them even with the higher priced Mokes.
For $15K plus, I would be surprised and suspicious if the seller isn't prepared to provide a local roadworthy cert, however this is certainly no guarantee that it will pass a Blue Slip. A Pink Slip (the regular NSW annual roadworthy certificate) is far easier to get a vehicle through and other states are much more complacent about certain aspects than NSW is.
Non standard modifications are a big trap when it comes to registering an interstate vehicle. Things that are OK in Qld or Vic, may still pass in NSW, but often only after expensive engineers reports have been obtained. Things like Mod Plates for extra seats, non-factory seats, roll bars, non standard engines etc are worthless in NSW. You may well need engineers certificates for all of these things and more. Interstate sellers often won't have them, as they don't need to produce them when renewing rego in their home state. Even if they do, you would need to find out if they are acceptable to the NSW authorities.
For this reason, you're probably better off looking for something as standard as possibleif looking at ex NSW vehicles and look hard at rust (a VERY common Moke problem - and a lot of inspectors know that, so will be looking), brakes, oil leaks and suspension.
That said, a lot of reasonably good Mokes for sale do need brakes and suspension overhauled anyway, which isn't such a bad thing as if you do it yourself, you know they're right - just so long as you know that before you buy, so that you can factor it in.
They can be a tricky vehicle for a newbie to assess, as the suspension is fairly unique and reasonably good Moke brakes will feel very ordinary to someone who's used to driving modern vehicles.
Newie