After entering the bank, they would separate into two groups, the first responsible for taking hostages, while the second went about acquiring cash and emptying safe deposit boxes (which were not under surveillance during opening hours).
They convened to commit a series of hold-ups, even several on the same day, then separated for a while (Berliner, for example, lived in the countryside near Carrouges with his wife and son), sometimes going abroad, before they would reconvene.
Amidst the robberies, and in the absence of any leads for the investigators, journalists treated the robbers almost as heroes, since the gang was respectful to their hostages and did not hurt them.
The robbers addressed the bank patrons and benefited from a strong sympathy among ordinary people, who smiled more than they were bothered when they heard that the Gang des postiches had struck again.
The police and the government eventually lost patience with the ease with which the Gang des postiches operated and their mythification by the press.
Unfortunately when they came out the situation devolved into chaos, owing to the rash behavior of the head of the BRB, Raymond Mertz, who started a shootout in which Bruno Berliner and a police officer, Jean Vrindts, were killed.
On 23 November 1986, Jean-Claude Myszka organised, together with François Besse (a notorious French jail breaker) the escape from prison of André Bellaïche and his cell mate Gian Luigi Esposito (with a stolen Red Cross helicopter).
Jean-Claude Myszka, André Bellaïche, and Patrick Geay were arrested together with Gian Luigi Esposito in December 1986, in a villa in Yerres after almost a year on the run.