I have a level 0 account that can trade items, after I got these cards in my inventory, they are no longer tradable but I still can trade CS:GO items? : r/Steam
How to trade and sell CSGO skins for real money outside of Steam - WIN.gg
Buying Trade Banned Steam Accounts for Skins is a Failure - YouTube
Steam Community :: Guide :: How to: Find Inspect link of ANY skin you Traded or Sold on Market.