Any person or persons entitled to a lien under this act shall, within 20 days after the pressing, threshing or hulling is completed, file in the office of the register of deeds of the county in which the hay, grain, seed or other products were grown, or pressing, threshing or hulling was done, a statement in writing verified by oath, stating the name of the person claiming the lien, the amount, quantity and kind of hay or grain, seed or other products pressed, threshed or hulled, the amount due claimant for said services as near as may be, over and above all legal set-offs, the name of the person for whom the pressing, threshing or hulling was done, and a description of the land upon which the hay, grain, seed or other products were grown or pressing, threshing, or hulling done; such description shall be deemed sufficient if it properly identifies the premises by the name of the owner or occupant, or other description which accurately and clearly identifies the location of the property upon which such lien is claimed: Provided, That such lien shall be deemed to have been waived by the person entitled thereto, unless such statement shall be filed within the period of 20 days as aforesaid.