a. The cylinder latch screw is messed up. This means that an improper screwdriver was used, and the slot suffered damage as a result. A hallmark of sloppy work.
I disagree with part of your statement.
I have a 445 that had never been dissembled when I bought it and the screw looked much like that one.
From the factory
Factory or not, the screw was messed up with the screwdriver slipped, apparently in the act of tightening from the divot marks.
Considering the QC involved, it may well have come from the factory like that. Maybe not. That screw is still buggered up, and is an indication of sloppy work by somebody who at the very least took a gander at the internals.
Run.