De Locomotief, 29 Mar 1952: a Blue Band margarine advertisement listing prize-competition winners. It was retrieved only because of the name Sumijarsi/M. Caropeboka (Bogor) in the winners' list; no Gerwani-related content. False hit, much OCR unreadable.
Het Nieuwsblad voor Sumatra page-4 advertisement (1 Apr 1952): a long Blue Band/Unilever prize-draw winners list (cars, scooters, radios, etc.) with hundreds of names and towns. 'M. Caropeboka - Bogor' appears as a ballpoint winner. Nothing indicates any link to Sumiyarsi Siwirini Caropeboka; the name match is coincide
Cinema advertisement page in De Vrije Pers (20 Jul 1954) for Surabaya cinemas (Spanish Main, Dr. Jekyll and Mr. Hyde, an Indonesian film "Leilani" with Mochtar and Metty Herawati). No Gerwani content; archive tag to Tris Metty rests on a film-cast name only.