I was just writing along those same lines, when I saw you responded!
I've read posts where Mosaic has said that the Boxed sets (not Selects) are sent out in numerical order. However, I was looking through my sets and I ordered the Lionel Hampton set in Feb. 2010 and that number is 4082/5000.
Okay, now we have definitive proof that they don't go out in chronological order. I got the Hampton set two weeks ago and my number is 2481.
So, the next time somebody says they put them out in the order they are shipped, just link to this thread and we can dispel that impression once and for all.
CRAP! Ok, the 4082 is the LESTER YOUNG set....My Hampton is 2415. I placed my order for both the Hampton and Lester Young sets on 2/16/2010. Sorry for the confusion. But even with my typo, you getting your Hampton and it's 2481, I ordered mine a YEAR ago and it's 2415. I sure hope they have sold more than that in a year!!!! WOW.
This has come up many times over the last several years, and every time someone contacts Mosaic, we get the same response--the big sets are shipped in sequential order (unless a set is returned, in which case that number is recycled). Brad received a similar response from Mosaic 5 or so years ago, and I used to quote the email HE posted whenever this came up, until I got my very own email (from Fred) a few months ago.
Sorry, FOTB.