LOS ANGELES — Caesar Sanchez looks out at the same sign all day, every day from his electronics shop in downtown Los Angeles: “Billionaire made here.” The B on that sign is pasted over an old M to update the word “millionaire,” because in July the small convenience store sold a winning Powerball lottery ticket worth more than $1 billion. A sign in the form of a check above the register at the Las Palmitas Mini Market marks the date (July 19, 2023) and the amount ($1.08 billion) made out to an un