Have you had a response from the Blegen Library? Did they say they did not have the wills you are seeking? If not at the Blegen Library, perhaps the data was in a list made at a given time, but the actual material could have been lost or misfiled. It may be necessary to make a visit to the Blegen Library to verify that the wills are not there. Every once in a while we read that official material turns up in some governmental office or archive, lost and unknown for many years. Good luck.