Somebody smart enough to success steal probably not stupid enough to use real ID anyway. Can buy fake passport/util scans for about $20 maybe more.
But if there were actual fake IDs or ID theft involved in this case, wouldn't Karpelès make it public? Wouldn't he say "I know which Gox accounts were linked to the theft but those users used fake IDs"?
That question in the Subject line is a rethoric question. The answer is that Karpelès still has got the coins.