Were they American Indian remains?
The 9th circus ruled that didn't matter in Washington and Oregon - don't know if a similar ruling was made for Florida.
Furthermore, it's a federal, not a state, matter.
This is a classic case where corpus standing is under the national treaty making powers authorized the Executive Branch by the Constitution, which is to say that any government relationship with this young man stems from the President of the United States, subject to what federal laws may be on the books in order to provide administrative procedures in such matters.
The assumption by the State of Florida, that two American Indian tribes in Florida ought to have some say, is nice, and it may feel good, but the jurisdiction of the young man's remains is federal, period.
Suffice to say, the young man, though long-appearing to be a "resident of Florida," is sufficiently old enough to be within the Constitutional domestic national powers recognition accorded the ancient American Indian tribes.
If the Florida based American Indian tribes wish to have some standing in this matter, they should address the White House, and the President of the United States should address them.
To be blunt: The State of Florida has no power to make a deal with any American Indian tribe regarding the national standing of any ancient American tribes, be they "Indian," "native," "indigenous," or otherwise.
But then again, you never know what laws have been to subvert this unique relationship between the tribal nations and the United States of America.
Probably Not...there were found within 50 miles of these folks.
European DNA Found In 7-8,000 Year Old Skeleton In Florida (Windover)
Sounds to me like they accidently came across Jimmy Hoffa.
Under the circumstances, I can't blame them for wanting to ditch the bones ASAP with minimal publicity.
I do hope the got some DNA for genome testing. Could tell us where he came from and relationships to modern Native Americans.