Joan Parker says she was worried about the shell, especially after her great-grandchildren started touching it.
Police examined the shell and X-rayed its contents to determine if it is a live round.
Parker says her son-in-law, Alan Pleasonton, found the shell last winter while fishing for conch in the Delaware Bay off Bowers Beach. Pleasonton was not home when she called authorities.
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Information from: Delaware State News, http://www.newszap.com