Isn't every coin really an Early Release no matter the Label? How can you Really Tell?

With only 100,000 25th Anniversary Silver Eagle Sets from the U.S. Mint and all sold the same day, doesn't this really mean they are all early release despite the label or date? That said at least several of these coins could have been minted much earlier and just added to this set by the mint. They may be "Early Release" for this set, but they could have been minted long ago.

So what's the difference between a PF / MS 70 coin and an "Early Release" version other than the often higher price for the special label? The U.S. Mint states the following on their website:

"The United States Mint strives to produce coins of consistently high quality throughout the course of production. Our strict quality controls assure that coins of this caliber are produced from each die set throughout its useful life. Our manufacturing facilities use a die set as long as the quality of resulting coins meets United States Mint standards, and then replace the dies, continually changing sets throughout the production process. For bullion American Eagle and American Buffalo Coins, the United States Mint makes an average of about 6,000 coins from one die set.For proof versions of the American Eagle Coins, the yield is an average of about 300-500 coins per die set. This means that coins may be minted from new die sets at any point and at multiple times while production of a coin is ongoing, not just the first day or at the beginning of production."