The best is a photo of the unit displaying its serial number. Shows that it's working, that the S/N is correct, and that it at least has an A/C adapter. (stupid me didn't take my own advice and got a player with a dead HDD once.)
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FireFox31
110gig MKIIa (30+80), Eutronix lights, 32 meg stacked RAM, Filener orange gel lens, Greenlights Lit Buttons green set