Hard to tell and looks like it might be ok except for one thing. There is a old post that I'll try to dig up explaining the codes and how they are used. I don't remember the exact time they switched to the new system, but suppossedly it was done in alphabetical order, meaning the 2 letters they use in front of the six numbers for the first boxes would have started with AA and then AB, so on and so fourth. If that the case, then the D's would not have been started to be used till just recently. Sorry if thats confusing, but I'll try to find it since it explains it a little better than I am now.