Boy I wish I could be more help. You might need someone to weigh in who has the same model boat. All boats I am familiar with have open draining all the way from bow to bilge under the floor..that way if you take on water, it eventually flows to the bilge where the pump can pump it out.
I'd be real careful drilling a hole though, because often the fuel tank is right behind it.
I wonder if the PO was "annoyed with their stuff always getting wet down there," in that storage compartment, so sealed it up with a layer of fiberglass. Are you able to get in there with a flashlight to see if you can see a dark hole beneath the glass?
I know I always wished my ski locker would stay dry, but if you get water in the boat, you certainly want the bilge pump to be able to clear it out.
I guess you could either figure out where the drain should go and drill it...or install a bilge pump in there or just manually bail it out if it fills up and air dry it.
Is the compartment sealed in front too? Meaning water from under bow area of the floor can't get in there?
Maybe they rigged it so water under the floor is routed around that compartment and you have nothing to worry about. In that case...just keep it dry in there!