Spent a weekend in the Keys, Islamorada to be specific. I stayed at the Postcard Inn which is right on the Atlantic ocean. The views were amazing and the sunrises were even more spectacular. This is the location of the former Holiday Isle. If you grew up in South Florida as I did, you probably spent many a day or night at Holiday Isle. I can’t drink rumrunners to this day (I tried to have all my weekend fun in one night, paid for it)!
Anyhow, I haven’t found any shells yet, except for a queen conch shell right off the shore which was occupied. But I don’t think you can take conch shells in the Keys regardless. I’ll keep looking and keep you posted.