Past winning numbers are lotto numbers that have come up, and numbers that you didn’t have, whether you played or not. In dreams, this can be symbolized as a sign of regret. Maybe you regret something that you did, or didn’t do?
The past numbers represent missing a chance or an opportunity. Maybe at the time, you didn’t realize what you had done, and now subconsciously, you’re kicking yourself for not doing something you now know you should have done. You need to let go of the past, and focus on the present. It can also be a foreshadow of what’s to come, and you telling yourself to focus on the future, and not let go of an opportunity. If you have the ability and chance to alter the past go for it, and in a sense, play those winning numbers.