Hi Supercindyy, I found the store in Dallas : Loewe Forty Five Ten, 4510 Mc Kinney Avenue. Dallas. I would suggest that you call them up with the serial number given on the bag. That would be the best thing to do really. Better still if you could go into the store with the bag and have them look at it. I do not have the phone number for the store but hopefully, you can look it up. I use this website for my orders, see if you can access it too and have a look for yourself:
http://www.loewe.com/international/
Go to the bottom of the page and use the store locator icon. Also, get in touch with the store and see if you can place an order with them and if they will send it out to you. Good luck - US$320 is good money to spend but certainly not on a fake!
Looking at the pictures again, I am so suspicious because the tag with the "Made in China" and serial number is not even, well proportioned or/and well stitched.