Invalid Report: 76561198010520640 - (ElfAttacker (Means "Cat") / [Steam] Steam Games)

Scam Report

Report Type: [Item Fraud] Fake items or item duplication
Virtual item type involved: [Steam] Steam Games

Accused profile: 76561198010520640 (ElfAttacker (Means "Cat"))

Victim profile: 76561197972229646

What happened? Description:

i traded with the user ElfAttacker for the game Don't Starve, i gave him 3 game gifts for this title, and he traded the game in CD Key 3rd Party Redeem.
just yesterday i got a notice my game was revoked and my subscription was removed from my steam account.
i contacted the trader and he accused another user name HalmyAK, for giving him two copies of Don't Starve, and both copies were fakes/illegal.
one of those copies he gave me... and he didn't had any proof whatsoever for the trade transaction with HalmyAK.
i tried negotiate with ElfAttacker but with no luck.
please help me​

Provide Evidence:

i provided 3 pictures, one for the trade i made with ElfAttacker, one for the notice on the game revoked, and one with the user he accused.​