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Middle 90's I believe, they were having a counterfeit problems at the time, if I remember right.
So they added the signatures, to make it harder to counterfeit.
The box could be from 1999 to early 2001 based on the lack of a second band, and the inclusion of a signature on the back. Topped a thread for more info.
I wish I knew the answer. The person I bought them from said he had them for over 3 years. All I really know is what Moki posted here; they were made sometime between 99 and 01.