First, a general warning - read those Guides CAREFULLY. The one Guide I could find that mentioned that number said "J8Y- and J4D- prefixes have shown up on some well-copied fakes in both fabric and leather" and it was listed under the heading "The following numbers are OFTEN USED ON COUNTERFEITS but can also show up in genuine bags and need to be looked at very carefully:" There's a difference there. Also Coach doesn't have every style number in their system especially since they only went online in 1999. Coach's computer system can't be depended on for accurate information. Some bags with that prefix MAY be genuine.
However, this isn't one of the genuine ones. I don't have any record in my catalogs of when styles 9074 and 9075 were released but many Limited Edition bags never made it into the catalogs. 1998 sounds too early though especially if you have one dated 2001. A while back another one was discussed - the wording on the creed reads in full: "This is a Coach bag, part of a limited edition. Originally designed for Coach by Bonnie Cashin in 1970. Manufactured in the US of natural top grain cowhide, its superior craftsmanship and attention to detail reflect our commitment to enduring quality." That one had a serial number of J0B-9075, and the creed wording apparently matches the one you bought recently that DemRam authenticated, although the creed photo was hard to read the Cashin reference is still visible.
That leaves us with 2 genuine styles made in 2000 and 2001. The 1998 date in the one you questioned combined with the differences in the creed stamp definitely indicate fake. The serial number prefix is a red flag, the creed stamp difference is actual proof. The sloppy stitching on the one in the listing just adds more evidence.
Feel free to report.
WOW, was all set to spend $350, thank you so much....