This candy fell out of the hands of a defeated Longbow infiltrator in a story you like to call:
There's a Sucker Born Every Minute
It all started when your contact, Willie 'Dealer' Wheeler, called you up about a big problem. it seems most of Willy's jobs have originated from a source who has recently been taken captive by Arachnos forces. Willy losing his source meant no more jobs for you, so you decided to free Willy's source, a man known as Ace McKnight.
McKnight wanted Willy to find someone to take out the Arachnos agent that was coming after him - which was where you came in. Attacking the Arachnos base, it was discovered McKnight was actually a Longbow agent that Arachnos had been tracking for months. Worst of all, Arachnos thought you were in league with Longbow as well!
Willy Wheeler pleaded with you not to go after McKnight, because interrogation of the Longbow agent would reveal Willy as the dupe who had been unwittingly setting up all these jobs for Longbow.