how do i report this man who have many copy csgo skins?

his steam id:
http://steamcommunity.com/profiles/76561198097167512

he is a seller in china,many skins which he sell are copy items!

For example:
st fn howl : csgo.exchange/item/325431871
st fn m9 cw: csgo.exchange/item/631726477
st mw ak serpent: csgo.exchange/item/129707649
st fn m9 marble: csgo.exchange/item/1528403011

how do i report this man who have many copy csgo skins!

he copy items,A small investment brings a ten thousand-fold profit!

how can he do that?

i don't know.....

1) I don't think it's possible to "dupe" CS:GO items.
2) It is suspicious that they have 3 games yet 110 level account.

1）you can check the float,same!
2)up to 110 level so easy,only need some money!

yeap, there are items in TF2 that have dozens of copies by now.

i want to know how to report them!

yes, and dota2

The only real way is to report them to steam support via a ticket. For that seller isn't the one duping them, he's just the outlet/fence. Normally the outlets/fences aren't behind the duping itself. They just have some contact that supplies them with them.

support via a ticket? how to do?

https://www.google.nl/search?q=steam support

How does this guy not get picked up by steam? Like surely they'd notice something fishy, having trades to alts same mac/I.Ps etc?

I know enough tricks to get around that... oh, and valve not recording the mac is also part of that... Valve knows most about the honest ppl, the fake ones.... lets just say I know enough to hide everything from each account. They made it a bit harder with the requirement that money must have been spend on the account itself. But not by much.

Then again there are mac spoofers are available but they don't necessarily work all the time.

But regardless of how much information is hidden surely the information will lead back to their main account like trades etc. This account trades to that account that account trades to another account that other account eventually trades to his main. That trail would be still there.

Maybe Valve should track the trades contraband & convert/rare items more closely?

those ppl don't use a "main", they buy old accounts from some forum, and use those till they get banned again, and move on. Forget the "main" account idea, only real traders have a "main"