The required number of ballots for each precinct shall be wrapped and sealed, and each package shall be clearly marked on the outside to indicate the number of ballots contained in the package and the name or number of the precinct and the location of the polling place for which they are intended. The ballots shall be delivered to the precinct election officials together with other necessary election supplies, as provided by section 49.55, and one of the officials shall sign a receipt for the ballots which receipt shall be preserved by the commissioner. The commissioner shall keep a record of the number of ballots delivered for each polling place, the person who signed the receipt for them, and the time they were delivered, on a form which also provides space for the entries required by section 50.10.