Checks referred to in article 1, paragraph 3, of Presidential Decree No. 458 of 1999 shall be carried out by the Central Authority for Fraud Prevention. They aim at verifying correspondence between the designations of origin of the virgin olive oil leaving the packaging plants and the designations of origin of the quantities of virgin oils used. Approved packaging establishments shall keep a register, providing the information specified by article 4, and submit it to the Central Authority for Fr