It is state law, its not like a parking ticket. State doesnt confiscate your detector, or car, or boat for speeding tickets or Jay walking, but can do so for illegally hunting lease areas.
Penalties for illegal salvage
Third-degree felony: Intentionally excavating or disturbing publicly owned submerged historical sites without written permission from the Florida Division of Historical Resources is a third-degree felony.
Administrative fines: Florida law allows for administrative fines of up to $500 per day for anyone who salvages historical objects from state lands without a permit.
Injunctions: The state can seek court injunctions to stop unauthorized salvage operations.
Confiscation and forfeiture: Those convicted can have all of their gear and equipment used in the violation forfeited.
Prison sentences: In addition to fines, convictions can carry prison sentences. For example, a man who illegally sold coins from a 1715 fleet shipwreck faced up to 15 years in prison.
Prohibition from salvage work: As part of plea deals, individuals have been banned from participating in any future salvage operations.
Theft charges: Violators who illegally take and sell artifacts can be charged with dealing in stolen property, leading to additional penalties.
You can also face federal charges..
FYI, Queens Jewels pays multiple homeowners who live on the beach where leases are to report any suspicious activity in the water that involves metal detectors, the state also flies helicopters over the lease areas looking for violators.
Remember, illegally detecting/hunting the leases means you are stealing from the state and Queens Jewels, and the state both take it very serious.