4. Delacroix discovers a boat adrift, and retrieves and anchors it. The boat features a number on its side and other evidence pointing to its owner, Elvira. This is

An involuntary bailment.

Explanation:

This can be a bit questionable if it could be a law; but obviously yes, it is. As the person involved in an involuntary bailment is seen to be of possession a property which tagged to be without negligence. It is seen to have many scenarios e.g can be seen when a lost briefcase in seen to be under custody till it is delivered back to the owner, also when a tenant vacates at a lease end. The bailee is seen to have context before anything happens.

i heard they are taking it off i hope this isn't true but otherwise if it doesn't get taken off it will probably be in early december or early january of 2018-2019