The women, Veronica Butler, and Jillian Kelley, vanished on 30 March.
Their car was later found along with evidence suggesting foul play.
Two bodies were found on Sunday and are being formally identified.
Four people, all belonging to the “misfits” group, have been arrested on kidnapping and murder charges.
According to prosecutors, Butler and Kelley had arranged with the grandmother of Butler’s children to meet at a highway intersection in Oklahoma to pick up the two children, aged six and eight, and take them to a birthday party.
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