The suspect, 26-year-old Timothy H. Miller, told police he picked up the child because he thought he could buy drugs from him, according to an affidavit.
Puerto Rican Twitter users coined the term "Caribbean Vikings" and created their own "Starter Kits" in case Puerto Rico becomes "a colony of Denmark."
Some of the employees have declined interview requests, Justice Department investigators say.
More than 20 agencies covered 105,000-square miles searching for the two men, who didn't return from a fishing trip Friday.
The veteran safety has played on three Super Bowl-winning teams in his 9-year career.