The so-called YKK Rule is BS, just like the huge majority of "rules" found in almost all online guides:
http://reviews.ebay.com/Coach-Authenticity-Guides-Facts-and-Myths?ugid=10000000062607882
If you want details on anything I've written there, you can ask. If you want proofs, I can supply those too.
The difference between the Salearea Guides and most of the dreck posted on the internet is that I spent six years researching, collecting, and comparing information from thousands of sources including listings for both real and fake Coach items. I don't claim that I can tell you what Magic Details can prove a Coach is genuine, because there AREN'T ANY. And I don't claim to have all the answers because I don't. But I stand by what I write and post instead of Copying & Pasting some other idiot's "guide" and putting my anonymous name on it. I can back up what I say and anyone who wants to question or challenge it knows exactly where to find me, unlike the other 6000 Guide "writers" that disappeared into a black hole as soon as their BS was posted somewhere.
So yes, I've done good work and spent a lot of time, effort AND money doing it and I'm not hesitant about saying so. Anyone who would prefer to believe some nameless nitwit whose claims can be proven false by something as easy as a trip to the nearest Coach store is welcome to. That's THEIR decision.
"Also, not all Coach items have creeds or serial numbers. Aside from the obvious items like wallets (although I've seen maybe 6 styles with genuine creeds) small bags that Coach considers ACCESSORIES such as Swingpacks, Pouches, Demis, Cosmetic Bags, Crossbodys - anything small enough to fit into a larger purse - may or may not have a creed patch, and those patches may or may not have serial numbers. There are no Rules about what style gets and doesn't get patches and numbers. NEVER assume that a smaller bag is fake because it doesn't have a creed. When in doubt, ask at Ebay's Purses forum or other purse authentication venues."
You answered my question right here. All I needed to know. Thanks!