Declined Matt hax Scammer!!!

Victim:
Me

steamID: ϟSatoshiKunϟ
steamID32: STEAM_0:0:48856429
steamID64: http://steamcommunity.com/profiles/76561198057978586
customURL:
steamrepURL: http://steamrep.com/profiles/76561198057978586

Scammer:
steamID: ◄Matt Hax►
steamID32: STEAM_0:0:699522
steamID64: http://steamcommunity.com/profiles/76561197961664772
customURL: http://steamcommunity.com/id/CookieCrumbleFappachino
steamrepURL: http://steamrep.com/profiles/76561197961664772
ScreenShots:
(Didn't Screen Shot The Chat)
I've only Got The Weapon Tht He Scammed Me From
And He Has Making Negative Comments, Scamming Multiple people (That Info I Know For SURE)
Plz Help Me

''Satoshi's Loss''

This item has been renamed. Original name: "Three-Rune Blade"

Team Fortress 2
Level 10 Sword​

On Hit: Bleed for 5 seconds
On Miss: Hit yourself. Idiot.
''One in the chamber, 3 in the pot. Satoshi got tricked, and "she" isn't even hot.''
Item Wiki Page...​

Tags: Genuine, Melee weapon, Scout, Tradable​

He Bugged me For Over
15 Mins (I Didnt Know There Was A Block Button And Was To Busy Playing Hale)
Description(Forgot to Write Down)
He Wanted 3 Keys So He Can Buy 3 Rune Blade
Said He'd Give Me 4 Keys Back And A Ref
in 5-7 days
he did not pay me
Plz Help!

Got screen shots of chat, trade, or trade history?

I'm Srry I Dont Have A Screen Shots Of Trade or Trade history
I Dont Have The Chat But idk How To Find The Trade And History

Without a chat, there is no way to verify if a scam took place. However, in the future, trade history is ascertained by opening your inventory page in the Steam Community. In the top corner of that page should be a link saying "Show trade history" or something to that extent. Screenshots of this is required for most types of reports. However, in this case it would be moot due to the fact that no trade agreement through chat can be obtained.