Hey folks, just a heads up for those that use USPS Informed Delivery: when you get around to applying for your U.S. passport, and they mail your naturalization certificate back, it might not show up on your Informed Delivery as it may get delivered in a large envelope. They didn't tri-fold my certificate, as they might other documentation (i.e. my child's U.S. birth certificate did show up on Informed Delivery, as that one was tri-folded and placed in a standard envelope).
I just wanted to let y'all know here because I know I was a bit anxious waiting for my naturalization certificate to come back and was watching Informed Delivery like a hawk. Didn't want to pay another fee to USCIS to get it replaced, lol!