driver's door will not lock

[kieth]

We all go through lots of little problems as we build our trucks so initially I could not remember my problem with the drivers side lock on my GMC. Then it dawned on me, my drivers side door did not even have a keyed lock in it. The keyed handle was on the passenger side, so I swapped the tumblers and buttons so I could gain entry on the drivers side instead of the passenger side.
Never asked about it, was this just a PO's mistake or did trucks come this way ???