The fun part about the keel locking bolt is when you've taken it out when you inspected it for wear and cross-threading...and forgot to put it back in. Then, once off the trailer and you get the boat tied off to the dock, there's an odd "glugGLUG glugGLUG" sound that you can't seem to place. No, it's not the water slapping the boat from that powerboat's wake...that dissipated quickly. Hmmm...I better check that old through-hull, head fitting. Nope, that's not it. It's louder now closer to the v-berth. Where the heck could that sound be coming fr...$%&@!!!!
Yep, about nine gallons later I found the culprit. So, I grease mine and never use it. I've had to cut bent ones off, seen the keel gouges from them on other 22s, so the likelihood of them actually keeping the swing keel in place during a knockdown is slim. To each his own, though.
As for your situation, Skippy, I'd venture a guess that either (or both) your port lower or aft chainplate has a leak; or any number of the forward screw holes from your main hatch slide or hand rail. Maybe even the forward window although I'd think that water would end up more on the shelf than the locker. I know because leaking screws in my slide and hand rail were causing me the same issue. Not a lot of water, but a strong rain would leave me a present. Baby powder eliminated the keel lock bolt. Give those a shot and report back!