Well, I've got three boxes (2 empty, one full) of the postcard paper and none of them have that batch number. My full box (and the one before it, likely to have produced the defective images) have a photo of two dogs on the front, the other box is older which actually shows the back of the postcard paper as the main feature image. Anyway, my codes for the newer (?) boxes are 78D576X32 (full) and 40D503C20 (empty) - I guess I'll try to contact Harman and see if I can find out how old the batches are.