Why would they put a FFC on a early model that was supposed to be a 3g phone and then just take it away later? I'm very sure it will have one, but it will just work over WiFi.
Test fitting? Like in some older automobiles, they would be wired for additional options but missing the extra goods. My vehicle was wired for A/C through the dash, but was not fitted with the compressor or condenser. Same chassis, but "upgradeable". This would fit with the theory of an early 3G/no FFC, later 4G w/FFC without the added expense of another shell, just internal components.