It seems like the glowing mark is an artifact of the pack being search and then resealed 20+ years ago. I have talked emailed a number of people since the original post, including BBCE. BBCE is familiar with glowing spots on the pack but could not determine anything from it. They indicated the other DS packs FASC do NOT have a glowing mark on the back of the pack.
Interesting though, they use the trait discovered by Joe R and discussed in detail in previous DS threads about using a blacklight to help identify DS cards.
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