You stated in title of the Post "Nearly got scammed 5 btc" but I don't see any bits transacted to the given BTC address the scammer Provided.
These Scamming attempt regularly happen overhear , Instead of Opening a separate thread and Over-heading BCT server by making threads , you could have reported the MSG/Thread to Moderators , you could Even Pm About such Incidents to Tomatocage ,QS,Hilario or other concerned Mods.
Remember Next Time.