While it is never explicitly stated that Faq sacked Valdez, it is almost a certainty. As of LIAB Text 43, it is stated that, with the taking of Progrock, Faq had four cities. Thus, Valdez not being counted among them, it must be assumed that it suffered the same fate as Kona, and was sacked.
Real World References
Juan Valdez is the fictional character created as a mascot for advertising for the National Federation of Coffee Growers of Colombia. He appears as a simple coffee farmer.