I'm not sure about that. From the press release:
Upon a review of the Troopers body and dash cameras from his initial response to the crash scene, investigators know that approximately 900 feet from the collision scene, the following articles, belonging to Jason, were discovered in the roadway; a backpack, a ball cap, a plastic bag of personal toiletries, and a tumbler with his deceased beta fish in it. These findings were north of the clothing, recovered the next morning by Jason’s father.
I interpret that as Jason's father having given both the backpack and clothing to LE, not just the clothing. UNLESS the "recovered the next morning" only means the clothing, which is confusing.