Has anyone noticed the month/year on locks?

I was just wondering if anyone who recently purchased a Birkin noticed the month and year stamped above the keyhole?

does it looks something like this 09-06?

I have the same thing stamp on my lock too and I purchased my birkin a few months ago from H directly. I was curious about the extra num on the lock since the lock was one of the ways for ppl to tell if it's authentic. I asked my SA and was told that it couldn't be a date, it might just be something new that H is doing with their locks. The craftsman in nyc told me the same thing too.
 
For all you know, Hermes does not wish to reveal the logic for the number engraving, to stall the scammers from hitting the production line and speed away with making fake Hermes locks for the rest of time!