I've always wondered this, too. I think some of the "new" bags they list are bags that were purchased on impulse and then the buyer has buyer's remorse. Also, FP may have employees who regularly stalk the LV site (and other sites) throughout the day to snag items the second they pop up, then list the item for a profit since it's so impossible to find. I've purchased a couple of older bags (2-3 years old) from them that were listed in "Excellent" condition and they looked new when they arrived. Not sure if the previous owner just rarely carried them or why they were in such pristine condition.
If there's an item you dearly want at the LV website, make a direct link to it on your taskbar or phone and check it frequently throughout the day. Occasionally they get a return or list an item and you may catch it. I've had that happen with a few items on their site and when I checked afterward, it was showing sold out again, so they literally had only listed one item and I was able to catch it.
BTW, I wouldn't worry about the item you have on reserve. I've found that they normally underestimate the condition of an item so if it was listed in New condition, it really should be. Also, I was told recently by a
Fashionphile Representative (when I was considering putting a bag on reserve) that if you have an item on reserve and it later turns out that it wasn't in the condition described in their ad, they will allow a return.