Invalid Steam card scam.

Scammer: happymushroom
SteamID32: STEAM_0:1:40403655
SteamID64: http://steamcommunity.com/id/happymushroom100/
CustomURL: http://steamcommunity.com/id/happymushroom100/

Victim: Cheeseness
SteamID32: STEAM_0:1:24740809
SteamID64: http://steamcommunity.com/id/SWAGYOLOMONEY/
CustomURL: http://steamcommunity.com/id/SWAGYOLOMONEY/

Yesterday, my friend Cheeseness was offered 20 Dollars and 50 Dollars Steam Card codes for his Smoking Armored Authority. Cheeseness wanted to trade with a legit trader so he asked him all these questions. Firstly Cheeseness asked what are parts of the code. Happymushroom replied answering parts of the code. Claims that he got scammed a few times and that he won't scam Cheeseness. Cheeseness then asks for his trust, and yet he'll do the 20 dollar steam card code first. Cheeseness came to a conclusion and agreed with this whole trade. Cheeseness trades his unusual first then happymushroom sends the full code. Then the code doesn't work as show from the bottom. happymushroom then blocks Cheeseness of all communication. This is the story of using an invalid code as a scam. There would be three pictures of proof/evidence provided below.

Hello, Steamrep has changed their investigation policy on CD Keys.
Steamrep is not processing any reports relating to CD Keys, as they are impossible to verify.
Instead, what they want you to do is to write a Steam Support ticket.
http://forums.steamrep.com/threads/notice-changes-to-investigation-policy.47952/