Caro Quintero, the former leader of the Guadalajara cartel, had since returned to drug trafficking and unleashed bloody turf battles in the northern Mexico border state of Sonora.
The state prosecutor acknowledged that there are still five graves pending analysis due to the lack of staff.
An unconfirmed number of bodies was found outside the Mexican city of Guadalajara in four different regions.
Prosecutors said they had identified 13 people so far – 12 male and one female, all of whom were previously listed as missing in Jalisco district, which is home to Jalisco New Generation, one of Mexico's bloodiest and most ruthless drug cartels.
Experts trying to establish how many victims are in the mass grave since it was discovered earlier this month in a remote area known as La Primavera outside Guadalajara, Mexico's second city.
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