The original link is dead so I'm not certain that it's the same case but the circumstances seem to fit what little information is given in this thread.
NamUs UP Case Number: 6152 https://identifyus.org/en/cases/6152
ME/C Case Number: 2004-2317
Miami-Dade County, Florida
30 to 34 Year Old White Hispanic/Latino Male
This is a still unidentified man who was found at SR 836 and Florida Turnpike in Miami, discovered by police inside a car in a fresh water lake.
Date found October 17, 2004 at 12:00 AM
Estimated age Adult - Pre 30
Minimum age 30 years
Maximum age 34 years
Weight (pounds) , Cannot Estimate
Height (inches) 68, Measured
-Black jeans "Levi Strauss" 31*30 and a belt
-Size 8.5 brown LUGZ
-Watch stopped at 6:35. a gold colored ring with two crosses.
Personal effects also include a cell phone clipped to the jeans, dental floss containing little plastic bags of white powdery substance, and a wallet containing multiple identifuication cards.
Dentals are available, no fingerprints, DNA submitted but tests not complete.