The best method for securely storing and retrieving physical documents with sensitive information is to have a secure and well-regulated filing system. Here are some steps you can take to securely store documents:

1. Store only the documents you need for reference or required archiving.
2. Keep a master list of documents.
3. Keep documents in locked and secure areas.
4. Utilize a password-protected digital filing system for online storage and easy retrieval.
5. Back up backup systems periodically.
6. Ensure files go through the proper security protocols and protocols of disposal when no longer necessary.