Twaddle
Until the CVR and FDR are published (Might be a while if the drivers got shot by an armed robber or one of the guards).
Having met quite a few robber types in far flung places, I can assure you their Intel and planning capabilities can be real top notch, even for a fistfull of credit cards.
One chappie even cut through a US embassy fence some years ago, snatched a handbag and legged it so fast even the Marine at my table could not catch him.