If it worries you that much, haul out & check it
But since you say there are no apparent leaks, why don't you spend a few hours on the boat with the bilge floorboard removed and the automatic pump incapacited. Assuming that like all of us you have 0.5" to 1" residual water that your pump can't pick up, mark the level with a grease marker, incapacitate the float switch with a weight, leave the floorboard open, crack open a cold one and do something else for the next few hours while the boat is level. Checking your bilge from time to time. If after 2 or 3 hours the level of water is still the same, re-activate the float switch, re-install the floor board, crack open a cold one, smile and forget about it. If you are still worried, haul out and inspect the keel/hull joint. If you hit hard enough with the keel (unlikely at idle speed), that is most likely where the infiltration will take place.Good luck