Each involuntary patient previously transferred to the Mid-Hudson Forensic Psychiatric Center, Kirby Forensic Psychiatric Center, Rochester Regional Forensic Unit or Northeast Regional Forensic Unit who is a patient therein on the effective date of this Part, shall be served within one month of such date with a copy of this Part, a statement setting forth reasons why such patient needs continued retention therein, and a notice of the patient's rights to object to further retention at such facility. A copy of such statement and notice shall be served upon the nearest relative of the patient, if there be any known to the director, and upon the Mental Hygiene Legal Service. If there is no written objection made by or on behalf of the patient, the patient may be retained at Mid-Hudson Forensic Psychiatric Center, Kirby Forensic Psychiatric Center, Rochester Regional Forensic Unit or Northeast Regional Forensic Unit subject to the provisions of section 57.4 of this Part. If there is an objection, the procedure set forth in sections 57.2 and 57.3 of this Part shall apply.