Any keeper of a hotel, inn, boarding house, lodging house or furnished apartment who shall have a lien for fare, accommodations or board upon any goods, baggage or other chattel property, and which being in his possession for 3 months at least after the departure of said guest, boarder, lodger or tenant leaving the same; or who for a period of 6 months shall have in his custody any unclaimed trunk, box, valise, package, parcel or other chattel property whatsoever, may proceed to sell the same at public auction after first having given notice to the county treasurer of such intended sale, and out of the proceeds of such sale may, in case of lien, retain the amount thereof, and the expense of advertisement and sale, and in case of unclaimed property the expense of storage, advertisement and sale thereof: Provided, In all instances, the notice specified in the next section be first given as therein directed.