Over the years, Coryn Cornelissen of Zaandam, Holland has corresponded with several Wyckoffs and the editor, Beth Bassein, of the old Wyckoff family Bulletin where she also published a few pages. Coryn has searched the Provincial archives in Middelburg, and the Municipal archives of Zierikzee, where according to Anjou, the mother of Pieter Claessen, Margaret van der Goes, lived and died. Coryn found nothing of any Van der Goes family. Coryn went to Gorkum to search the archives for a Pieter mentioned by Anjou, and discovered that not one of the details listed by Anjou turned out to be true. Among the dozens of persons with the common names Claes and Cornel; Coryn Cornelissen found only one possible candidate Claes Corneliszoon (with no surname) born in the town of Brouwershaven on the isle of Schouen on 12 February 1606, but could find absolutely nothing that would link him to Pieter Claessen of Nordingerland.
What Coryn has been unable to find over the past several decades on the ground in the Netherlands confirms what several scholars throughout the 20th century (beginning with Van Laer around 1900 up to Bryce Stevens in 1982) have been saying. There is no link between Pieter Claessen Wyckoff and any Van Schouwen family. The parents and siblings of Pieter Claessen as well as his birthdate as listed on this WikiTree profile site have no basis in fact.