Thanks again, Maurice. If ever the Leiden trip pushes through, I'll write to the curator beforehand to ask for permission (hopefully, he/she will grant it).
On a related matter, I think there's a team from the Philippines' national museum who go that Leiden museum from time to time to catalogue the Phil. items (and have in fact published at least one book already). It's cool that your country has preserved those Philippine pieces for study by generations to come