As used cars sold on the North American auto auctions are for export only, there is no difference where you live. You can take part in auto auctions online from any part of the world. Even if you are American, but you want to buy a vehicle for your relatives in Nigeria. Many people from all over the world buy cars from the USA because there is a great choice and it's really cheaper than purchase a vehicle from the local dealers.
Of course, you should also know that sometimes such purchases can be risky. So please be aware of scams, if you don't want to send your money to someone's fraudulent pocket. Check thoroughly all the information about the company you are going to do a business with. Read customers comments and testimonials, as well as visit government websites to see if this company was properly registered and licensed.
Before exporting, it's also important to check your local government regulations on the used vehicle import. Get a clear picture from the respective government institutions about the car clearance procedure, the due duties or taxes and vehicle restrictions.
Thus, it doesn't matter where you reside, you can register from anywhere and make the used car purchases at the North American auto auctions from the comfort of your home.