I think the thing I would really look at closely is the transom and lower unit. Here's my thinking...if someone pulls a boat up on shore they often lift the motor enough so the skeg isn't stuck in the mud. A wave or two over the back and now the boat is sitting 12-16 inches lower in the water. And the wind that created the wave over the back probably didn't stop after wave #2, so the boat sat there for some time with the motor stuck in the mud/gravel/sand as waves rocked the boat repeatedly.
Not exactly sure what I would be looking for, but something along the line of a stressed transom seems reasonable.
Personally, I think that is something akin to the worst case scenario.