I don't make it into the Avis forum too often, but this sounds like a legitimate question, as long as the poster has done an ounce of homework. Pound my head if I'm incorrect in that assessment.

For example, AWD Z2511077: who is it? It's on an private e-mail list and it's the only one on the list that isn't already somewhere on the FT Avis Discount Codes thread, but I won't pollute that thread with it until I know more. I've googled and called Avis twice; was told, if I'm authorized, I'd know who it is already. Seems to do very well some places in the U.S., nothing at others and give-or-take overseas.

The broader (hopefully not too boring or redundant) questions: Is there a sure-fire way of knowing ahead of time which codes are safe for civilians? (I know the big no-no codes already and I regularly use a number of other codes knowing I won't be asked for anything extra.) Is it possible to make a booking and immediately ask if any special documentation/ID is needed and be sure of getting the correct answer? or are we always at someone's mercy at time of pick up?