how would they know you didn't buy lobsters at the store and put them in the freezer?
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Your question is a good one and should have been answered along time ago.
Lobsters are crustacea and are further sub divided by genus and species. Each has its own distinguishing characteristics, of size color, configuration and defense mechanisms.
It is noted that you reside in Boston, near the center of the east coast lobster industry. The lobsters there are distinct in that they have claws, are smooth bodied and closely resemble the common fresh water crawfish. These lobsters are scientifically identified as "homarus americanus."
On the west coast of the US from about San Luis Obispo (1/2 way between LA & SF) to Cedros Island off Baja Mexico (1/2 way down Baja) the lobster are identified as "panularis interruptus." They are dark red almost brick color and are covered with a spiny infested shell similar to rose thorns as a defense mechanism.
In the Caribbean area there is a distant cousin the "panulirus argus." The p.Argus has distinctly long legs, bright colored body and also covered with spines.
Currently the California and one would assume the American market has been infiltrated with p.Argus from central & south America, the "panulirus cygnus; "the famed "Australian rock lobster" and on occasion the south African rock lobster, the jasus ilandii. They also have spines and brightly covered shells.
Therefore, armed with a a certain amount of knowledge and a little experience it is certainly not difficult to distinguish if the lobster was caught locally or purchased from the local market. If over the accepted in possession limit there has been a violation of the law--straight and simple.
In the 1960s the California F&F (Fish & Game)re- located a number of fry and adult h.Americans to the waters of northern California. Few if any h. americanus survived the ill fated and poorly executed experiment
For your information the rarest of all California lobsters is the famed "homaris californicus." a cross between the east and west coast lobsters, large claws as well as long sharp spines, however only a few have been seen or captured. One 16-1/2 pound specimen was displayed for about 20 years in the shop that taught Dr Bill his diving skills, the Aquatic Center of Newport Beach. The owner and Dr. Bills instructor, Mr. Ron Merker had a standing reward of $1000.00 1980 dollars for a live one delivered to his shop..lots of people saw them but no cigars
SDM