NO, it's not a typo. It's the actual serial number prefix. Read some of the threads about how many Shields S&W is producing daily and you'll see why the serial number prefixes are where they are. See for yourself.
9mm Shield
Purchased: 10/01/12
Serial: DXY94xx
Test Fire: 9/07/12
M&P 45c
Purchased: 4/05/13
Serial: HAB01xx
Test Fire: 2/7/13
** Someone suggested creating a spreadsheet. Since I'm new to the forum, consider this my gift to it. The document can be viewed by anyone having the link. If anyone wants to be an editor send me a PM and I'll set you up. Let me know if it shares okay... And if possible if the OP would be willing to post this at the top it might be useful for others. I had to guess on some things for example the Model if it wasn't given. Also some had inconsistent fire dates compared to the series so I marked them in color.