How to Spot a USPS Scam?

I almost fell for a usps scam, but I won’t lie this looks too legit 🤔but everything that threw me off was 1. I didn’t order anything that would go through usps and 2. It’s Sunday they don’t deliver mail on Sunday. At first I thought it was my sister in law that I knew she is planning on sending something and I was about to email her but realized she doesn’t know my email address lol... this is a scam it has to be, it took me to the official usps website and everything but when I copy and pasted the “tracking” number it says it doesn’t exist nothing is attached to that number.

Be on the look out these scammers are getting craftier.