My point of view, is that as they have boxes of weapons, flasks, lighters etc, is that they probably have more than one type of things.
So glad you have a large television, care to take a cell phone pic of the shot? Because that would be more helpful than just flat out saying I'm wrong. Not that I'm saying your wrong, of course, I'm just trying to help verify things.
I looked all over the internet for the shot of the knife in Mommy Dearest, but I guess I'll have to take a photo right off the dvd.
As far as the book being wrong, well yeah, it's not perfect, but it's also been the nicest resource for those of us either new to the series, or not having an inside scoop.