N.J. Stat. Ann. § 54:5-126a

When any municipality has heretofore conveyed and transferred to the State of New Jersey for use as forest park reservation all its right, title and interest in any land pursuant to the act to which this act is a supplement and the said land has not been used as a forest park reservation, such land may be conveyed to the municipality which made the conveyance and transfer to the State of New Jersey, as provided herein. The Commissioner of Conservation and Economic Development shall first determine that such land has neither been used nor is suitable for use as a forest park reservation and is not desired for said purpose. Any such determination shall be subject to the approval of the Division of Parks, Forestry and Recreation of the Department of Conservation and Economic Development. If so approved the said commissioner shall execute for and in the name of the State a deed of conveyance to said land in such form as the Attorney General shall approve. The municipal grantee shall accept the deed and cause it to be recorded.