LOS ANGELES As she walked from a post office, Talon Curtis thought she'd found one of those gimmicky sweepstakes offers on the ground that scream something like "$357,959.55" in big bold letters and "This is not a real check" in much smaller type. But just as she was about to do her part for a cleaner planet and deliver the paper from the parking lot to a trash can, she noticed it was a real cashier's check with a real signature.