Many of the others are still located a few metres from the property, jumping back and forth over the facility's fence, police said in a statement.
The Rhesus macaques made a break for it on Wednesday after an employee at the Alpha Genesis facility in Yemassee did not fully lock a door as she fed and checked on them, officials said.
The monkeys on Friday were exploring the outer fence of the Alpha Genesis compound and were cooing at the monkeys inside.
The primates continued to interact with their companions inside the facility on Saturday, which is a positive sign, the police statement said.
Alpha Genesis CEO Greg Westergaard relayed that efforts to recover all the animals will persist throughout the weekend and for as long as it takes, the statement said.
The monkeys are about the size of a cat.
They are all females weighing about 3kg.
Alpha Genesis, US federal health officials and police all said the monkeys pose no risk to public health.
The facility breeds the monkeys to sell to medical and other researchers.
Alpha Genesis provides primates for research worldwide at its compound in Yemassee, about 80km northeast of Savannah, Georgia, according to its website.
25°C