I would hesitate in speculating the 'serial number' on the S5 Le equates in any way to the number actually produced. Seeing as the numbers were not imposed on the knives in any numerical order except no duplicates. I would guess that many/most of the <101 knives were filled but over that is likely anyone's guess.
For the Skelescrapper I would like to see the knife be <4" and have a thin kydex or like materiel that is shaped to fit like a pocket pistol holster. Neck carry will likely not get much use by me but a small, thin belt or pocket holster will likely make it a most used knife.