1. At the term of the county commission to be held on the first Monday in March, the collector shall return the delinquent lists and back tax books, and in the city of St. Louis the uncollected tax bills and back tax books, under oath or affirmation, to such commission, and settle his accounts of all moneys received by him on account of taxes and other sources of revenue, and the amount of such delinquent lists, or so much thereof as the commission shall find properly returned delinquent, shall be allowed and credited to him on his settlement.

2. Before allowing the collector such credit for any delinquent lists, the county commission shall make special inquiry and be fully satisfied that he has used due diligence to collect the same, and that he could not find any personal property of the taxpayer out of which to make the taxes.

3. If the commission is satisfied that there are any names on the lists of persons who have personal property out of which the taxes could have been made, it shall, in passing upon such lists, strike such names therefrom.