Mod note: thread subject edited for clarity.
Ticketing hasn't released a voided ticket list yet, and even when they do it's never complete (they do the best they can, but they're dealing with a lot of moving parts the next two months). Once they release it to us we'll have it up, and update it as they send them.
If you purchased physical tickets, make sure they're real: they should be on heavy, high-quality stock paper. The printing is flawless, and contains multiple types of holographic & metallic inks in very thin lines - turn the ticket in a well-lit room to see them. The "eye" is embossed, so you can feel it with your eyes closed. The tiny red dots printed on the flame are in neat rows and printed in metallic ink. The holographic ink is on both sides. Look at the fine print on the back of the ticket with a magnifying glass/ app: it shouldn't be blurry. If your ticket looks cheap it isn't real (note to OP: I know you've gone before, but these details are important for anyone reading the thread).
If you purchased Will Call tickets, make sure the ticket transfer is completed. Once this is finished they're safely yours, there is no way for the original owner to transfer them back. Note: this is only good for Will Call tickets at this point:
https://ticketsupport.burningman.org/cu ... se-s-name-
).