Mont. Code Ann. § 27-18-602

If personal property attached is claimed by a third person, the person shall give notice to the sheriff and deliver to the sheriff an affidavit, stating the person's claim, ownership, and a description of the property. Unless the plaintiff, within 10 days after receiving notice, gives the sheriff a good and sufficient bond to indemnify the sheriff against loss or damage by reason of retaining the property, the sheriff shall deliver the property to the person making the claim.