#2 What is inside the McMahon Lockbox?

In February 2016, Shane McMahon returned to Raw and demanded that his father Vince McMahon let him run WWE's flagship show. His trump card was a secretive lockbox that he had held on to for years and if the secrets were revealed, some of Vince's darkest and deepest secrets would be exposed.
Considering what we already know about the WWE's chairman, it has to be something pretty big that Vince was willing to put his top TV show on the line to save him from embarrassment.
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Vince gave Shane an opportunity to earn his place as Raw's General Manager by putting him in a match against The Undertaker. He lost that match after attempting an unsuccessful Leap of Faith off the top of the cell, but Vince still put him in charge of Raw, thus ending this whole storyline involving the lockbox.
The whole show was based around that storyline for months leading to Wrestlemania 32, but the management decided to end that abruptly and without giving the fans any logical conclusion.
Vince and Shane had solved their differences after that, so reasonably Shane does not have to unveil the content of the box, but judging by the time and interest that fans have invested in the story, they deserve to know the ending.