For audit evidence to be considered reliable, it must be accurate, truthful, and verifiable. The absence of the bank heading, logo, or address on the bank statements raises concerns about the authenticity and integrity of the documents. Without these elements, there is no assurance that the statements are legitimate and have not been tampered with or falsified. Therefore, this evidence may not be reliable for audit purposes.References:

The Institute of Internal Auditors (IIA), International Standards for the Professional Practice of Internal Auditing (Standards)

"Auditing: A Risk-Based Approach to Conducting a Quality Audit" by Karla M. Johnstone, Audrey A. Gramling, Larry E. Rittenberg