Banovac Denars: Are They Genuine Or Fake?

I can't comment on the authenticity, but the similarities in the missing portions of the coins suggests that maybe at some point they were clipped to remove some silver.

These look good to me. I'll admit I don't have one in my collection, but if you compare the lettering, devices, etc. with others being sold by reputable auction houses, you will reach the same conclusion.
Presumably you got a good deal because of the missing bits. That third one is really lovely despite the damage.
I've got a few early Low Countries coins with similar shapes removed from their edges.