SAVANNAH — Less than two years after he was released from prison, Lewis Jackson found authorities waiting for him as he boarded a ferry boat on remote Sapelo Island carrying a cooler full of contraband valued by some as a mythical aphrodisiac. Inside the cooler, investigators found zip-top bags filled with the ping-pong ball sized eggs of loggerhead sea turtles, animals protected by the Endangered Species Act. Stealing eggs of the threatened species is a federal crime.