Recover

From MUME

While wearing a quiver, a bolt case or a pouch for slingstones, you can recover the missiles lying around -- those on the ground, the ones stuck in corpses and the ones in your inventory. You will grab all the missiles you shot or bought, and put them back in your quiver.

You can also 'recover all': this will make you get all visible missiles, no matter if they are yours or not.

See also: Shoot, Archery, Missile Weapons