Locating Dutch manuscript sources

For the past decade (as part of the Mutual Cultural Heritage programme of the Netherlands National Archives), I have been compiling a series of archival guides to Dutch manuscript materials on India and Ceylon from the years c. 1600-1825 (titled "Dutch Sources on South Asia, c. 1600-1825", so far two volumes, published by Manohar, New Delhi).

I am now working on the third volume, covering Dutch materials of this kind that are kept outside the Netherlands. My question is therefore: do you keep or know of any manuscripts (both texts, drawings, and maps) produced by (order of) Dutchmen that somehow concern South Asia (mainly India and Ceylon) and date from the period c. 1600-1825?

I may be contacted at l.p.j.bes@hum.leidenuniv.nl. Thank you, Lennart Bes