never used a boat storage-- is it standard for them to assume responsibility for theft or not? Seems like if the answer's "not", then there's little incentive for them to provide anything other than chainlink and a padlock (for which the number of keys or distribution of the combination is probably not very well controlled).
Really sorry to hear that the scum swam to the surface near your rig, bruner. As a recipient of a visit from such dirtbags myself, I really, really do hope there's a hell....