In Sunday’s interview to franceinfo radio, Beccuau said the four arrested people – three men and a woman – “all live more or less in Seine-Saint-Denis”.
She said two of the male suspects had been known to the police, as they each had multiple theft convictions.
On Saturday, a 38-year-old woman was charged with complicity in organised theft and criminal conspiracy with a view to committing a crime.
Separately, a man, aged 37, was charged with theft and criminal conspiracy.
The suspects – who have not been publicly named – both denied any involvement.
Beccuau said the two were in a relationship and had children together, without giving any further details.
Two men who had previously been arrested were already charged with theft and criminal conspiracy after officials said they had “partially recognised” their involvement in the heist.
Investigators believe four men carried out the daylight theft, and one of them is still on the run.
Three other people detained earlier this week have been released without charge.
