Four powder-filled envelopes were left at San Francisco homes Saturday. The suspicious envelopes had the name of a fictitious Jewish charity written on them. The fire department´s hazardous materials team tested the substance and found it harmless. The envelopes were white and legal sized. They were hand delivered to four Richmond District homes. Police say the envelopes were slipped through mail slots and did not contain a return address or addressee. They did have a reference to “Special Events number 2002 of the Jewish Charity Awards.” Most of the recipients were not Jewish, however.