were lost through the negligence and change of companies, which shows that even Heywood's foul papers were kept by the theatre company, otherwise the plays could be reconstructed from authorial rough drafts. As Shakespeare worked for the King's Men, the same thing likely was true of his own MS plays
Comments
If anything they would be more likely to discard the MS's of plays that were already printed (or the printers would) as the print copies could be used for prompt books, which explains why the FF shows reliance on quarto texts.