Do you mean how many people have decided to dive those waters anyway and keep whatever they find without reporting it? If so, who knows how many people have done that, but from what I understand, people in those waters are monitored more closely than the "guests" who come across our Southern borders without an invitation.
I can't imagine what happens to people who get caught. It's not worth the risk. I still can't believe that a private enterprise has the sole rights to detect those waters and they are protected by the state. The Queens Jewels took over the lease in 2010 from Mel Fisher's company. Does that lease ever end?
I did a search on Yahoo about the 1715 lease and look what I came up with. Does this mean that it expired? If so, I guess they're hoping that nobody noticed so they can keep everything for themselves. It sure seems that way.
Somebody should contact a lawyer down in Florida who can verify if this is true or not. If it is not true, then find out when the current lease does expire. Then share the results with us here. We can start a fund to pay for the attorney's fees which will cost quite a bit just for asking one simple question.