We traded 36 Sets of Cards for 3 CS:GO Keys :-)
He made a trade offer after 24h Hours because he didn't had the full Trade Offer and didn't wanted to get something without giving something.
After waiting for 24h he made 3 Trade offers with 36 Sets included.
No Scam whatsoever, and he acted politely :-)
+rep Just traded with him via his trade link (his cards - mine key). All is ok