So what is Tom Brady’s missing Super Bowl LI jersey worth?

It’s hard to say for sure, but Josh Evans, founder of the online auction house Lelands.com, figures it could fetch at least $1 million, making it one of only a handful of pieces of sports memorabilia that could command such a high price.

But here’s the problem: Because Brady’s No. 12 jersey was stolen from the Patriots locker room after Sunday’s game, it’s unlikely it’ll ever show up on the open market.

“The more famous an item is, the more valuable it is,’’ Evans said. “But the more famous an item is, it can also be virtually impossible to sell unless, in this case, it’s to someone in the sports world underground.’’

There’s no question Brady’s jersey would have been valuable even if it hadn’t been stolen. Sunday marked the quarterback’s record fifth Super Bowl title, one more than Joe Montana and Terry Bradshaw won during their Hall of Fame careers. But its disappearance, amid the team’s locker-room celebration, makes it more coveted. (It also makes it the subject of an investigation involving authorities in Houston and NFL Security.)

Brady has said it’s “unfortunate’’ the jersey went MIA, calling it a “nice piece of memorabilia.’’ He also encouraged people to keep an eye out for it. “If it shows up on eBay somewhere, someone let me know, try to track that down,’’ he said.

Evans, who’s been appraising sports memorabilia for 30 years, said Lelands.com sold Babe Ruth’s 1920 jersey for $4.5 million. No one would pay that kind of money for Brady’s missing Super Bowl LI jersey, he said, but $1 million is possible.

“But it would have to be going to a billionaire’s basement,’’ he said. “It would take a very certain kind of person.’’

Phil Castinetti, owner of Sportsworld in Saugus, is skeptical that someone would pay that much money, especially since they may not be able to resell it.

“If someone walked in here with it, I’d reach out to Brady, tell him what the circumstances are, and go from there,’’ said Castinetti. “It’s amazing how it could just disappear like that. But I guarantee it’ll show up somewhere. It has to. Word gets around.’’