This post office picked up a package they delivere...

This post office picked up a package they delivered to my customer before the customer was able to pick up the package from their mailbox. Without the red flag up, without proper labeling. The package is now lost. As a small business owner, I cannot believe how unprofessional this post office handled this situation. The man I spoke to on the phone was polite, but clearly in no rush to find out what to do to track my product, they lost.