[charlesdm]

I think he meant the fact that banks were locked down by the Central Bank and Greek people couldn't withdraw cash they legally owned (yet foreigners, with foreign cards etc could).

Re tax evasion, perhaps for small amounts, but not meaningful sums. That money still has to show up somewhere in the banking system, at some point, if a counterparty accepts it. You could make the same argument about diamonds or gold ingots (though those are obviously less convenient to move around)