The team cooperated fully and the league found no wrongdoing, per Rapoport.
The inquiry into the tampering situation stemmed from comments Dallas coaches might or might not have made to Thomas before the Cowboys-Seahawks game in Week 3.
Thomas made it known in the offseason that he wanted out of Seattle if the Seahawks weren't willing to give him a contract extension. Dallas inquired about a possible trade, but sides couldn't agree on terms. When Thomas went down with a broken leg in Week 4, it wiped away any chance of a 2018 move.
Thomas now heads to free agency in 2019 where he should be paid as one of the best secondary players in the NFL.