@plastick probably around 2-3 weeks
Ive bought from several sources before and generally theres the real and the fake version of the lens cover. The fake is plastic and doesnt have the AR coating that reflects purple when held up to white light
the real one also has like a metallic edge around the holes for the screws but the fake doesnt
the ebay link i posted was genuine but sady its not so easy to tell just by looking at seller pics, 1 way i try to identify is the dark border around the camera hole. A fake would be pure flat black while the real one is more of a dark blue with the circular grooves pattern
currently im using a real one but will probably swap out for a fake one that is more expendable when i go for overseas reservist later this year