Not that I'm aware of, although two things may help - 1) adventure packs (so not helpful for OH&UH) switched from cardboard boxes to blister packs after Dwarrowdelf and later reprintings followed this new packaging. 2) if it's in a shop (especially an online one) it's likely to be the latest printing.
They actually switched to it starting with the Angmar Awakened cycle (5th cycle). I have the fist 4 cycles in the original packaging.
You're right though, that's a good way to tell whether it's a reprint or not (for the first 4 cycles anyway).