Last year, Wagner sold a jersey to a collector in Mexico through eBay. The two shared photos of their collections.
Related: Tom Brady's missing Super Bowl jersey found in Mexico
Wagner explained items in one of the photos caught his eye -- “a Tom Brady jersey and a Joe Montana game worn jersey, and the Tom Brady one in the Super Bowl 49 jersey when we faced the Seahawks,” he said.
“If he sent me everything else in his collection I would have never questioned it, but just because of that one jersey, you know, I threw off the red flags,” Wagner said.
After the news of Brady’s stolen jersey broke, Wagner said he knew the collector had it.
He called Houston police, the NFL and the Patriots. No one took him seriously, until he sent an email to the Texas Ranger Division.
“Within, you know, that hour, they called me back and they were like, ‘You know, what you have is ... real information,’” he said.
Wagner gave detectives the Mexico address for Martin Mauricio Ortega, who had an International Media Press Pass for February's Super Bowl. Authorities found Ortega on security cameras carrying what's believed to be Brady's jersey under his arm.
Police raided Ortega’s home, but he has not been arrested. The jerseys were returned to Brady.