This is the second time the 136-kilogram brass propeller has been taken from the residence.
In August 2011, the prop was removed and later found at a metal recycler.
The alert to this latest theft came on Friday, when the homeowner called police to report it had disappeared again.
Police say the propeller was removed from a rum-runner boat once used by Al Capone during the U.S. prohibition on alcohol in the 1920s.
A 55-year-old man was convicted in the first theft on a charge of possession of stolen property.Suggest a correction