All accurate...KaBars do come in specific shapes and sizes: but all the bigger knives have a relief channel on both sides of the blade and a blade guard/hilt. Also, as a poster indicated many moons ago, (10ofRods maybe?) all the larger fixed blade knives have one of two variants of proprietary coating on the blade. Presuming the ME was aware of those coatings, and presuming also that the blade contacted bone or substantial ligament with some portion other than the sharp edge, the presence of that coating in any of the wound paths would confirm that the knife was a KaBar. If the relief path, blade tip, relief channel and hilt all indicate a KaBar and more, a specific model: Connecting the absent murder weapon to the sheaf with both the KaBar and the USMC logo embossed in it, is...well, a slam dunk. BARD.
Considering that one of AT's motions is aimed at exclusion of Amazon "clicks", the trail there might not be an actual knife purchase, which the D certainly could not keep out of evidence if a purchase could be directly linked to BK. Amazon apparently sells a lot of knives because they have an option/filter screen for Manufacturer, Vendor, Size, Duty and much more. Cycling through those filters generates a memory line-item every time the screen changes...so changing vendors while holding Manufacturer=KaBar generates a "click" for each vendor. One quick session made 26 memory entries....
All JMO of course.
As comment: my library list by intervals, appears a whole lot more nefarious because of my involvement with WS.....Got to hope no one is watching.