User has been targeting Neopets sellers and scamming them.
They currently have 2 dispute threads up which are being looked in to.
If they PM you asking to buy, please don't go first or you'll lose your items.

Link to dispute threads:
http://www.sythe.org/report-scammer/1819849-dispute-against-ammurrica-scamming.html
http://www.sythe.org/report-scammer/1820433-scammed-ammurrica.html

I have no idea why he hasn't been banned yet.