Have you contacted eBay about this as well? Disclaimer... I work for eBay.

You need to contact them ASAP and get them involved. We work closely with the police on weeding out stuff like this. They may be able to help you nail this guy.

You need to contact the trust and safety department.

-- Gary F.
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Eeyore, Original Owner -- Mk II 80 Gb, Blue S/N #090000803 Tigger, 2nd Owner -- Mk IIa, 80 Gb, Blue S/N #40103789