For one thing, we are not told anything about putting toilet paper in the bowl. Is this to trap the poop? ? And why do you only have to fill two tiny holes?

This is what happens in my experience -- I am handed a plastic jar and told to bring it back. That's it. End of instructions. I have had to use MY OWN SPOON, in my HOUSE, to obtain the, erm, "sample". It's HORRIFYING.