Do I Go To The Post Office, Or Wait?

I Recently Bought A iPhone For My Son On Amazon, & I've Been Tracking It. It Was Shipped Via USPS. I Checked The Tracker It Was Delivered Today, But No One Was Home. It Said They Left A Notice On The Tracker. When I Got Home There Was No Notice In The Mailbox Or Door. So Do I Just Go To The Post Office Or Wait Till Monday?

Go to the post office.

What's with the bizarre capitalization?
AAR, ask at the post office.

Go there early tomorrow. If there's a problem, talk to the supervisor.