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Brian H (misunderestimated)says copyrighted Sept. 2004 (Nat. League set was inside of it) most of that set is part of my NL set on PSA's registry -- my AL set is incomplete and was put together the "hard way".
-- The copyright was the reason that both sets were considered '04 for many years. Sometime in the 1990's the prevailing wisdom switched on the NL set -- largely based on a piece in the VBC, if my memory serves me correctly.
The AL set is still listed at '04.
Personally I found Hal's reasoning dispositive of the issue although I would date the set at "sometime after the '05 season" just to be safe.