I don't understand how can you prove DV is actually DV. I mean does his drivers license say DV on it? I can pay somebody on craigslist $200 to meet some random stranger and say they are userb1. I don't see how that proves anything.
I think the only way it might have been proved was that because mods said even when you two were replying in this thread from the same location if you quickly snapped a pic from your iPhone or Mac book and of course blurred out your faces a bit. To show the both of you are actually there. That's something I would do if it was me in that situation but its too late now since now that I've mentioned it, it could be setup.