Sweelinck autographs

Are there any autographs of keyboard music by Sweelinck extant? There does not seem to be anything on IMSLP.

This article says there are none:


Is that still up to date?

I believe that is still up to date. There are no known autographs of Sweelinck’s keyboard music, as far as I know. That means that preparing a scholarly edition is difficult, and in my opinion the existing editions have mistakes - by which I mean, there are notes in these editions which I would change for a performance, just as there are notes in the Fitzwilliam Virginal Book which I would change.