So what is this 'raiding' thing that happened?

-Someone mistakingly raffles a low slot unusual, thinking it's a trading site (http://tf2r.com/kkkqjkj.html)
-People call non delivery
-Guy doesn't deliver and gets banned
-Someone finds outpost trade for said unusual and tells people to go post shit on his trade (http://i.imgur.com/MeNm4np.png)
-People do (http://www.tf2outpost.com/trade/7909359)
-Everyone who did gets banned