So based on the box's odds(which are the correct ones), its 1 in 1500 to pull any one of the four players.
These Gold autos weren't numbered, however the rookie cards were! There are 30 RC's if I am not mistaken. Each numbered to 3,500. So 105,000 rookie cards total.
There was ONE rookie card per box, so there were 105,000 boxes using those very simple stats. Times the 105,000 boxes by the number of packs, which I believe were 24...... I opened many of these boxes back in the day, and I'm pretty sure they were 24 and not 36 like I'm thinking. So let's say 24 packs per box.
So... when you times the 105,000 boxes times 24 packs each, it equals 2,520,000 packs total.
Odds of receiving a Gold auto is one in 1,500 packs. So you take the total amount of packs that existed - 2,520,000 and you divide that by 1,500 (the odds of the ONE auto), which comes out to 1680.
So 1680 total Gold autographs. Now divide that into 4 players in the Gold auto set, and that makes it exactly 420 cards each.
Answer: 420