All oaths, affidavits or proofs required under this Part shall be made before the Register of the State Land Office or before any officer of the parish in which the land is situated who is authorized to administer oaths and who uses a seal.  Officers, other than the register, may charge a fee of two dollars for preparing and attesting applications and affidavits for any entry under this Part and a fee of four dollars for preparing final proofs and attesting them.