The boat has a thru hull fitting just forward of the center console on the starboard side (below the gas tank vent), which I assume is for a bilge pump? The fuse panel also has a switch labeled forward bilge and it lights up when turned on. There is also a large storage box in front of the console that's bolted to the deck. maybe that is covering up and access port?Thru hull fittingStorage Box
That thru hull fitting is the drain for your coffin box. I hose runs from that up to the deck right under the coffin box. Move the coffin box and there should be a pie plate there for access.