I had a similar issue on my site when I gave away an iPod shuffle. i found the winner to be a cheater after he made 3 fake accounts on the site (it was a referral contest). here is what i suggest:
check all the profiles, see if there is any similar info (like registration email addies)...see if the accounts post...see if there is any distinguishing info in the profiles such as IM info etc. if there is IM info, send them all messages at once and see what happens.
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