I submitted it at the post office (Initial application), you don't use your own envelope and USPS ships it for you. You can offer to pay 25.xx for overnight but when I tried, the employee told me that they use "Priority 2 Day envelopes" and it would reach a day later so it's not worth paying the extra for overnight, I understand that priority 2 day is a tracked service but that fee is included in the 35$ acceptance fee at the post office. While I'm sure it's tracked, he did not give me a tracking number despite asking and none was printed on my receipt.

The receipt was for $35 Passport Acceptance and not for "Priority mail" so it doesn't have a tracking number. Also, it did deliver on 08/11 (submitted on 08/09) because my check was cashed on 08/12.