Maybe they bought thier old truck back... only to need the money for something else? Or realized that nostalgia's an illusion and as nice as that truck is, it may not have been as golden as they had remembered?
Which would be sad indeed... but I'm sure it happens. People want a vehicle they wish they hadn't sold, track it down at great cost, only to regret the hunt?
1984 F150: 300 L6, AOD, RWD. EEC IV / TFI, Feedback Carter YFA Carb. Stock everything but radio (for now).