The FCC I doubt is going into a dungeon to be farmed. It's in the cars of the wasteland (which I believe should be the source of all Junk pieces, not laying on the ground) and hopefully it stays there: IN THE CAR. It's supposed to be special, not sitting on a pedestal underground somewhere. Fuck.
It can be farmed right now. Zato just said he has found 12 fccs and Bantz described how he had put some serious time on finding them. Farming equals repeating the same tasks dedicated for one thing only over and over again without much of a risk. I basically farmed my fcc by entering a map, checking for a car wreck and getting out. If fcc was in a "dungeon" type of map as I described (an ancient highway) it wouldnt be riskless anymore and one wouldn't simply browse through the place due to the fact that there were others after the exact same item + possible npcs. If the chance finding fcc from that highway place was equal to current, the total ammount of fccs wouldn't suddenly soar.