Accepted 76561198109719699 (Guko), 76561198124152886 (Hammy @ twitch.tv/ham_my)

Accused:
| steamname: Guko
| steam3ID: [U:1:149453971]
| steamID32: STEAM_0:1:74726985
| steamID64: http://steamcommunity.com/profiles/76561198109719699
| customURL: http://steamcommunity.com/id/YanDoingBuyAndSale
| steamrep: http://steamrep.com/profiles/76561198109719699

| steamname: Hammy @ twitch.tv/ham_my
| steam3ID: [U:1:163887158]
| steamID32: STEAM_0:0:81943579
| steamID64: http://steamcommunity.com/profiles/76561198124152886
| customURL: http://steamcommunity.com/id/Magnataurs
| steamrep: http://steamrep.com/profiles/76561198124152886

Mark:
| steamname: аdvicebanana
| steam3ID: [U:1:23045495]
| steamID32: STEAM_0:1:11522747
| steamID64: http://steamcommunity.com/profiles/76561197983311223
| customURL: http://steamcommunity.com/id/advicebanana
| steamrep: http://steamrep.com/profiles/76561197983311223

Impersonated user:
| steamname: Hammy @ twitch.tv/ham_my
| steam3ID: [U:1:15298726]
| steamID32: STEAM_0:0:7649363
| steamID64: http://steamcommunity.com/profiles/76561197975564454
| customURL: http://steamcommunity.com/id/Magnataur
| steamrep: http://steamrep.com/profiles/76561197975564454


What happened?
The accused added me to buy my knife for cash. He said he did not want to go first, but would use an official middleman. He did say he'd add Hammy, but that took a while.
In the meantime I took it upon me to add a user that the accused had just added, and told him that the accused was up to no good and going to use a fake middleman.
It seems that the user in question copy&pasted that and sent it to the accused who then pasted it into my chat window to ask me about it.
The result is that the accused freaked out and broke it off. I did not actually encounter the fake middleman myself, but there is circumstantial evidence.

1. Pending Steamrep report against the user with the exact same accusation: http://forums.steamrep.com/threads/...-counter-strike-global-offensive-items.98811/
2. The profile link shown in said report, http://steamcommunity.com/id/Magnataurs/ , goes to a fake Hammy's profile
3. The accused added and removed the fake Hammy twice yesterday according to Steamrep:
http://steamrep.com/profiles/76561198109719699?t=1430178302 removed
http://steamrep.com/profiles/76561198109719699?t=1430177450 added
http://steamrep.com/profiles/76561198109719699?t=1430176544 removed
http://steamrep.com/profiles/76561198109719699?t=1430175279 added

Another fake Hammy:
http://steamrep.com/profiles/76561198109719699?t=1430158516 removed
http://steamrep.com/profiles/76561198109719699?t=1430064118 added

Correction: The accused just added another user who says that he wanted to buy items for cash with a middleman. And he added the fake Hammy again:
http://steamrep.com/profiles/76561198109719699?t=1430224195
http://steamrep.com/profiles/76561198109719699?t=1430224466 and deleted him again

Screenshots of chat:
http://files.f-o-g.eu/5gf2ge
http://files.f-o-g.eu/f66edb