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On February 7, 2020, Jared Diamond of The Wall Street Journal published a report of previously undisclosed details uncovered by the MLB investigation, drawn from a letter sent by Manfred to Luhnow on January 2, 2020, that was obtained by the Journal and interviews with sources.[135] According to the article, the sign stealing scandal originated in September 2016 when an intern named Derek Vigoa, who later became the Astros senior manager for team operations, gave Luhnow a PowerPoint presentation on what he called "Codebreaker", a Microsoft Excel-based program used by front office staff to log and decode opposing catchers signs and then communicate them to baserunners who would relay them to hitters. The report said Codebreaker was enhanced in June 2017 when the trash can scheme was developed. The report also said that Codebreaker was used both at home and on the road and Astros personnel continued to use it into the 2018 season. The sign-stealing operations were referred to as "dark arts" within the Astros front office.[136]
Diamond's report quoted emails from Luhnow and Astros employees who said Luhnow was not only aware of but also enthusiastic about the sign stealing operations, even though he denied knowledge of them to MLB and in public statements.[137] In a subsequent Journal article, Diamond quoted an email sent by an Astros employee named Tom Koch-Weser to his colleagues which read, "'I don't want to electronically correspond too much about 'the system' but Cora/Cintrón/Beltrán have been driving a culture initiated by Bregman/Vigoa last year and I think it's working,' Koch-Weser wrote. 'I have no proof that it has worked, but we get real good dope on pitchers tipping and being lazy. That information, if it's not already, will eventually yield major results in our favor once players get used to the implementation.'"[138] The article also quotes Manfred's January 2 letter to Luhnow as saying, "'Most or all Astros players were active participants in the Banging Scheme by the conclusion of the 2017 World Series. ... The Banging Scheme was so prevalent,' Manfred wrote, 'that witnesses regularly describe that everyone in and around the Astros dugout was presumptively aware of it.'"