Yup, they do have date codes (not serial numbers, these aren't stamped on bags) but with time they may get pulled up. I've seen this a lot on this style. It should be along the seam on one of the ends of the bag.
With the bag open, look at where the two edges of the canvas meet on the left side. Under that seam on the inside you should find the code stampe, but it's very faint sometimes. Check out this photo http://let-trade.com/lettrade-4e.php?fn=lcbazo19.
Hi! To: lv babydoll, and cpster, THANK YOU!!!! so much for responding you saved my life, I never would have found the code without you both.
I listed it on e-bay, and then couln't find the code, thanks for helping me breathe easier!!!