I have found the included one works and fits but the one from my proper Wiha set doesn't even though it is the correct size according to what size the bolt heads are supposed to be so yes we must keep the cheap free ones as sometimes they are the key to finding the right fit.
I have no proof, of course, but I absolutely wouldn't put it past a large multi-national company crafting proprietarily-sized bolts, screws & wrenches. I note that some screens, batteries & coolers come with little screwdrivers & various tools, I save all of them, haha.
Stupid cat of mine rams through the catdoor from outside around midnight like a SWAT Raid, then proceeds to "MEORRROWWW..MEEEROOOWWW" for about a minute or my STFU CAT!