There is a thin divider in-between the halves.Does not look like a split shot mold. There is no blade that would form the open slot. And no slot on the mold halves to use one. Can not tell if perhaps the cavity is cut to form individual shot though. Not like any I have seen.
Send them to Camelatoe , she can de-fur sniff.That scissors type thing is for pulling extremely large nose hairs.