Yesterday, I asked a question about the relationship between the Ur-Hamlet and Fratricide Punished / Der bestrafte Brudermord. The Wikipedia page about Fratricide Punished says that the play was first published in its entirety in 1781 even though it may have been written as early as 1586. However, at some point after 1781, the only extant manuscript of the play was lost, so all later editions of the play are based on the first print edition rather than the manuscript.
What I could not find in the Wikipedia article nor elsewhere is how and when the manuscript was lost. Was it lost in a fire? Was it stolen? Who was the last known owner after it had appeared in print?