Well for starters, if you have any deviating answers to any of my preliminary questions. (Units with non-US htline stickers. Units with deviating serial number formats. Units not made in Japan or China.) These preliminary questions are just so I can reasonably exclude other options from the form questions.
Do you know anything about the source of these 'boys? Like, do you know if they come from the returns department of an Australian store, or is their origin simply "undefined"?
The next thing would be to meticulously go through each of the units and fill in the form. There are quite a few questions that I want an answer to. Maybe the form will be a bit daunting to the average person. You'll have to judge when I have a preview ready.