I'm unable to write the requested article, as the provided source content contains no facts, names, quotes, dates, locations, or details related to a suspicious envelope, the prime minister's office, or saboteurs. The source material consists solely of unrelated Hebrew news snippets and advertisements about educational discussions post-October 7, science Olympiads, a product promotion, Yad Sarah volunteering centers, and Nespresso. Fabricating details would violate the instructions to use only the provided source information.