Anne Frank didn't "find" the Annex-they already had it. The Annex area belonged to her dad, and it was attached to his company, Opetka. Mr. Frank was preparing the Annex months before they actually had to use it. He planned on going into hiding on July 16th, 1942, but Margot received a labor camp letter so they left on July 6, 1942.
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The Franks' secret annex was discovered by the Gestapo on August 4, 1944. They were tipped off by an anonymous informer who remains unidentified to this day.