Actually I've seen pristine JC Ramona's go for even less at times, so whether your buyer got a deal or if you lost $$ for the sake of feedback is all relative.
I'm sorry your buyer's message upset you, and please don't take my response personally because only you know the condition of the bag you sent out (if things happened in transit, then only your buyer sees that).
But I have been on the receiving end of crap-ily wrapped bags - just got one as a matter of fact - a normally boxy bag jammed in a padded mailer overseas. I was dumbfounded that a seller who professed to love the bag would ship it so poorly. I guess she was trying to save money. My bag has a gouge in the leather that may or may not be a result of the shipping, and it is SO NOT nearly-new. I have not contacted the seller, I'm still so upset.
What baffles me though is how time and again, sellers and buyers have such different perspectives on the condition of the bag, and what constitutes acceptable shipping methods.

I agree with your buyer in that I don't give a darn how fast a bag gets to me as long as it's done with care. I wrap things I sell like babies in boxes that
fit, fully stuffed. If a seller is willing to incur extra expenses to ship
fast, why not ship
carefully instead in a big, stuffed box that takes a few days longer??

By doing so, you avoid opening yourself up to such criticism - is saving a few bucks really worth it?
As for condition, perhaps some people are less picky than others, or different lighting affects what they can see? Dunno, but it's always a risk so it's better to understate a bag's condition than overstate. Even BNWT can have scuffs from the store so sellers still need to examine bags thoroughly, not saying you didn't - but it's a pretty strong absolute to say "there are no scuff marks, anywhere .. if they are there now she put them there." Whoa.
The existence of receipts, care or authenticity cards, dustbags, etc listed in auctions can weigh heavily on someone's decision to purchase your item and how high they bid, especially if they're concerned about resale value. Your buyer thought she was getting an original receipt included in her $800, but maybe she would've only bid $750 if you said "copy of receipt"? I can see where she'd be upset as I've had that experience too.
If she wants a discount and you give her one, I'm sure she'll leave you positive feedback. But check her feedback too for any indications that she repeatedly muscles sellers into discounts or such - in that case you may call her bluff.
I hope things work out for you and your buyer to everyone's satisfaction. Better luck in the future
