How many 1991 Score Mantle autographs are there?

A little over a week ago I posted a break of three boxes of 1991 Score 2 in an attempt to get a Mickey Mantle autograph.  Of course, it was all for naught.  It's a needle in a haystack kind of search.  According to Beckett and the Score pack wrappers themselves, there are 2,500 autographs in the entire series, and the series is woefully overly printed.

The Mantle autographs are supposedly spread over seven different insert cards.  That seems a bit weird since 2,500 isn't evenly divisible by 7.  I did some poking around on eBay and found two surprising lots.

One is an autographed copy of the Speed and Grace Mantle card.  It has a serial number of 0007 out of 2,500.

1991 Score Mantle Autograph - 5 - Speed and Grace #0007/2500

The other interesting card is an autographed copy of the Twilight Mantle card.  It also has a serial number of 0007 out of 2,500.

1991 Score Mantle Autograph - 7 - Twilight #0007/2500

That's two cards with the same serial number.  Mantle didn't sign just 2,500 cards.  He signed 2,500 of each of the seven insert cards.  That's 17,500 autographs.  With a little more poking around on the web, I found an old thread on the Blowout Cards forum.  In this thread, one poster also came to the conclusion that there are 17,500 autographs (give or take).

That's a lot of autographs.  I mean, with that many autographs out there, it should be easy to pull one from a box.  The odds, however, still stand at 1:30,000.  Now that's overproduction.