Mich. Comp. Laws § 168.152

Sec. 152. Service of such restraining order may be made either personally, as in the case of ordinary process of said court, or in cases of emergency such service may be made by registered or certified mail. Notice of the issuance of such restraining order may be given to the officers to whom the same is directed, by telegraph or by telephone, in advance of the actual service of said order, and after the giving of such advance notice, said officer shall be charged with the same duties with regard to the preservation of the ballot boxes and ballots as after actual service of a copy of said order.