Hello, Alfredo,
Heiko Ahlers is right: all places, stated by you, are located in the eastern part of
the "land" (= federal state of) Schleswig-Holstein.
WASBUCK (not Wasbock), zip code 23768, a small village south of WEISSENHAUS,
belongs to the community of WANGELS
WULFSDORF, zip code 23560, formerly an independent village, now is a suburb of the town of LÜBECK
WEISSENHAUS, zip code 23758, situated at the bay of HOHWACHT (baltic sea) used to be an aristocratic manor, now is a well known holiday resort.
Unfortunately, I do not know, which parish archives (or other institutions) should be
contacted by you to obtain the birth certificate (or similar documents) looked for by you.
Therefore you might want to contact
famnord@genealogy.net
I am pretty sure that some members of that list will advise you whom to contact.
Good luck
Jens-Peter Schütte