I dont think, he is scaming...
I would be aware, that keys may be carded and if owner of card contacts police, than you may have problem (and your steam will be blocked).
Why would he sell keys for only 1,6$, if they are not carded? Any ideas?
so thx for your aware and remind ,and i can say i use the lower price buy the others and sell it ,you can believe it or not ,this is my business secret,and i can told you ,if the keys is carded ,all trade account will be blocked in short time ,all account ,seller and buyer !but i can close trade and keep the stock for much days !because i have believe what i sell it's all clean and legal,if no one buy it ,it will be keep in our account and stay here to wait somebody buy it ,if we sell the carded ,we all blocked in short time .but we don't ,so if you think it's carded and plz go away and buy it from market for $2.77 for each ,we will stay here ,.like santouao ,we have been talk so much ,and he is my image !i will keep sell like him ,just stay here and wait the lie scattered !