USPS Issues - customers are saying packages are not delivered

I have had a lot of orders recently where customers are messaging us asking where their package is.

Almost all of the tracking details from USPS say "Delivered, Left With Individual" or " Delivered, In/At Mailbox"

What am I supposed to do? How do i stop the incoming A-Z Claims or inquiries from customers asking where their package in?

@Glenn_Amazon@Bryce_Amazon@Jameson_Amazon@KJ_Amazon@Kelly_Amazon