Ping me when they find the lost play in his own Shaky hand.
The known lost play is “Cardenio”, a page or so survives. Shakespeare collaborated with some younger playrights on the revision to the play “Sir Thomas More”.
It’s possible, even likely, that at least some were lost, but he died early in his 50s and his output was quality over quantity (although regarding Shakespeare’s reputation of not striking a line, that is, he wrote long, Ben Jonson said, “would he have struck a thousand”). Due to the 1666 fire, and the prior deaths of most or all of the people who knew him, the First Folio probably represents all of his work his old colleagues could get their hands on.
Quartos, which were scribbled-down excerpts made during play performances, have survived here and there. In one of these the “To be or not to be” soliloquy of Hamlet doesn’t show up until Act II.
Anyway, Bill’s handwriting:
https://nosweatshakespeare.com/sir-thomas-more-play/