Neighbor bought a container a couple years back. Don't remember the price but sure remember the clusterf....of the delivery. I don't think the truck driver was very good, he sure got stuck and it took a rather large old tractor to get him out.
Anyway the neighbor's container has a pretty nice wood deck and is vented, top & bottom. I am pretty sure that has to do with ships loosing them over the side. If sealed they will float for a very long time and I know that it is one of the biggest hazard to navigation and probably the highest rate of collisions with objects at sea....floating containers. Yep we had to go babysit a few of them many years ago until a tug showed up and dragged them ashore.
Too bad we are not in the salvage business, there was also a lot of nice lumber floating around, probably enough to build a very nice shed/barn.