Hello, your friend http://psteamcommunity.yuanyoumao.com/id/cutebirdy/ is a scammer. He has scammed others and is going 2 make up some dumb story. Here is a video he made of his scam "https://youtu.be/QSZMG6iTMtw?t=3m13s" you can tell this is fake because the time he accepts the butterfly knife trade is 12:37 in the trade offer but 12:52 on desktop
His main is http://psteamcommunity.yuanyoumao.com/profiles/76561198058817691/
Just wanted to warn you and make sure your'e not a part of this since he said friends help him.