The Evening Star of Washington, D.C. is digitised in full by the Library of Congress in Chronicling America, from 9 October 1854 to 12 July 1972, under the Library of Congress control number sn83045462. That run includes the last week of November 1965, when the Star reported the disappearance of Anna Maria Hitz and, on 26 November, her mother's doubts about the cable from Caracas. Every page can be read, searched and downloaded without an account.
How to find the issue
Open the Evening Star's title page at loc.gov under the number above, choose "browse by date", pick 1965 and then 26 November, and open the first edition. Chronicling America also searches the recognised text of every page, so the surname alone, with a date range of November 1965, brings up the pages that carry it; recognised text on 1960s newsprint is imperfect, so a search that returns nothing is not proof of absence, and the pages themselves are the record. The Library notes that it believes these newspapers are in the public domain or carry no known copyright restrictions; the family's clippings carry its own pen marks and remain the family's.
The other papers of that week
The Washington Post of 23 and 29 November 1965 is in ProQuest Historical Newspapers, which most public and university libraries provide. The Washington Daily News of 26 November 1965 is held on microfilm; the Library of Congress newspaper reading room is the place to ask. Blick of 25 November and 16 December 1965 is on the Swiss National Library's e-newspaperarchives platform. The Caracas papers of January and February 1966, La Verdad, El Nacional, Últimas Noticias, La República and El Mundo, are in the family archive as clippings; for the full runs, the national library in Caracas is the right question.
The family publishes twelve of its clippings, including this one, in the 1965 Press File, and sources every claim on the facts page. A story that asks to be believed should also show where to check.