I had my front bumper repaired a few days ago and today noticed a visible difference in the "clearness" between the lens on the right versus the left headlight. A headlight switch by the repairer ?
Do the headlight units have a manufacture date stamped anywhere ?
If so, where ?

 

I reside in Melbourne, Australia
The delearship here is not cooperating in advising me whether there is a Date of Manufacture (DOM) stamped on the headlight, I am fairly confident there is one (for QC, recalls, etc. purposes) however it is not visible from the engine bay. Before I disassembly the bumper etc I would very much appreciate if someone with more experience could indicate where it is stamped, I might be able to read it with a mirror