If you like to authorize someone to receive a package on your behalf, here is a sample authorization letter to receive a package.
Subject: Authorization to Receive Package
This letter is to authorize [Name], who resides at [Address], to claim and receive my package on my behalf from the representatives of [Company name]. This is because I will be busy with some work and will not be available to receive it on my own.
I have enclosed my identity proof with this letter to prove that this letter’s bearer can receive and retain my package with herself/himself.
In case you have any doubt regarding this authorization letter, kindly reach me at [Email/contact number]