About 10 -12 years ago I used to get given parts from stores that were obvious bogus parts. Stuff like spelling errors in the castings, eg: 'hydrulic' instead of 'hydraulic'.
Now days when I contract to smaller companies I install parts that look ok, have the correct paperwork attached and fail straight away on test. Then when an inquiry is made on the failure we find out the inside was never touched or was fitted with non approved parts.
But my company who is a bigger one, still has problems with bogus parts, and yes these parts, for us, seem to come out of FAA approved repair stations.
For those of you who think the bigger legacy airlines don't have bogus parts on their shelves, think again, the problem is bigger than we all think.