Invalid Report: 76561198015423976 (StaszY)

Victim:
steamID: ImpossibruZZ
steamID32: STEAM_0:1:47242693
steamID64: http://steamcommunity.com/profiles/76561198054751115
customURL: http://steamcommunity.com/id/ImpossibruZZ
steamrepURL: http://steamrep.com/profiles/76561198054751115
SOP forum account (if applicable): ImpossibruZZ
Scammer:
steamID: StaszY
steamID32: STEAM_0:0:27579124
steamID64: http://steamcommunity.com/profiles/76561198015423976
customURL:
steamrepURL: http://steamrep.com/profiles/76561198015423976
Screenshots:
http://imageshack.us/f/850/staszyscamm.png/
http://imageshack.us/f/266/staszyscamm2.png/
http://imageshack.us/f/824/staszyscamm3.png/
http://imageshack.us/f/339/staszyscamm4.png/
http://imageshack.us/f/232/staszyscamm5.png/
http://imageshack.us/f/18/staszyscamm6.png/
http://imageshack.us/f/441/staszyscamm7.png/
http://imageshack.us/f/846/staszyscamm8.png/
http://imageshack.us/f/220/stillnodiablo.png/

He admits that he used the key on my account but as you can see he didn't , now he blocked me and never gave my dota2's back..

Unfortunately, according to SteamRep Investigative Policy:

These reports we will automatically mark as INVALID and will not be researched or actioned.
It is advised, DO NOT ATTEMPT THESE TRADES. These trades are listed below:

1) Game key or Activation code scams
It's usually impossible to verify the key or activation code in question, trades of this nature are outside of SteamRep investigative policy.

It is therefore out of the bounds of investigation for this forum. I am sorry, but I have to mark this as invalid.