If the theory is correct, the scammer is pork_, aka hondura, aka honduras, aka pork_honduras.

pork_ = buyer - http://paste.pocoo.org/show/403595/
hondura(s) = seller - http://paste.pocoo.org/show/403594/

IP addresses: 65.49.14.*

Here's a log of a conversation with the scammer and KCanini that just happened moments before I'm posting this: http://pastebin.com/RhSdEmxJ

Unfortunately I don't see anything where JackH (jacker224) directly communicated with any of them in my logs.  Obviously at least part of it would have been PM, if not entirely PM.

EDIT: Other nicks in my logs (which don't go back very far at this point) using IP addresses in that same range are:
titi
Miner-TE
guest1234
bridgehead
mazik

grepped log showing those nicks: http://paste.pocoo.org/show/403613/