If you would like to authorize someone to collect documents on your behalf, here is a sample template you can use to write an authorization letter to collect documents.
Subject: Authorization to Collect Documents
This is to inform you that [Authorized personnel’s name] has been authorized to collect the following documents. He/she has informed us about his/her purpose. We have evaluated it and deem it fit for him/her to collect the necessary documents. He/she is to take due responsibility in handling the documents and ensure that they are returned without damage. Since he/she has agreed to this condition, please see to the fact he/she receives these documents.
The following are the details of the documents he/she has been granted access to. [Insert details of necessary documents]. In case of any queries, please find me at [Your contact information].