AFAIK, there are not explicit rules about recovering throwing blades or arrows. I would personally would say that recovering throwing blades would not be too hard most of the time. Occasionally they would be lost (fight on top of a building and missed, etc). Arrows I would think would generally be harder to consistently recover. They may break or suffer structural damage on impact, and hits that penetrate deeply would have to be hacked from the corpse, a time consuming and messy prospect, probably not practical in most working situations. If someone was desperate and needed the ammo and had the time, I might ask for a simple edge check to see how many they could get back.
Bone lacing and cyberspurs do not stack. Bone lace helps with basic punches, spurs when you pop your spurs and slice with them. You don't get to double up on the damage.