This response is provided based on the information you shared and should not be used as the sole source for making a decision. You should seek guidance from the chain of command, IG, JAG or other certified agencies before making any decisions. How you chose to use this information is totally up to you and is your sole responsibility.
See the specific information contained in AR 25-22, The Army Privacy Program. Generally the Soldier has to sign a document allowing an individual to maintain copies of all privacy information including PII. Even leader books should have a privacy act statement signed. Usually the unit maintains a counseling and administrative file at the unit headquarters. This should by my understanding contain a signed privacy act statement. For a specific answer with an exact reference I would recommend contacting your S-1 and/or the local IG.
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