As a matter of principle, and according to the Nobel statutes, the Norwegian Nobel Institute can never confirm, or disconfirm, whether someone has been nominated for the Nobel Peace Prize until 50 years have passed.
Any person or organization can be nominated by anyone eligible to nominate. There is no vetting of nominations prior to the nomination deadline, hence the Norwegian Nobel Committee has no influence on the quality of the submissions. The task of the Committee is strictly limited to selecting the best candidate (or candidates) among the entire list of submissions. To simply be nominated is therefore not an official endorsement or honour extended by the Nobel Committee, and may not be used to imply affiliation with the Nobel Peace Prize or its related institutions.