I add this animation assignment from stock frames to the FPE...
anim92 = 328,355
...then I use something like the meleeclose10.fpi, but I call animation 92 instead.
I setframe=92 and incframe=92 until it hits the frameatend=92.
I learned how to run a single animation like that from one of Bond1's scripts, so if you have any of his earlier character packs, then check out their scripts.
I can't remember whether the meleeclose10.fpi was stock or one of Bond1's scripts, but it is what I modify for melee, and I change the movefore to runfore with anim=5 instead of 1 for non zombies to make them faster.
As far as bare hands go, I think it was one of the model packs like 9 or 10 or something that had hands.
So, maybe that weapon is what you are thinking about and not a script. (which would explain why you can't find it)
I might be wrong about the model pack number, but check them out for bare hands, because I know one of the model packs has them.