A note on receipts:
They are very easily faked by "professional" counterfeiters, and also available with minimal effort to everyday people. I won't bore you all with the details, but as part of my job I have had to authenticate (and in many cases, debunk) receipts from major retailers and specialty stores.
I won't reveal what the big giveaways are for fake receipts (maybe prevent the counterfeiters from improving their game), but if the receipt is an important step in your personal process for authenticating a bag, I would recommend that you phone the retailer and speak to an SA to make sure that the receipt is legit.
As an example, I learned of a service that creates register tape with watermarks, return policies, etc. for major department stores. The counterfeiters just print a fake transaction on the front side of the tape. It looks so real!! People make these fake receipts for auction sites, to return stolen merchandise for cash refunds, etc.
It's a nice extra, but I don't put a lot of weight on receipts. It took me a long time buying and window shopping Bal displays before I felt comfortable purchasing resale handbags from private sellers. I've been lucky so far, but also very picky. The authenticators on TPF are fantastic, an especially great resource when considering an oldie or some other discontinued style that you can't study in IRL!!!