"Greeks cannot withdraw cash left in safe deposit boxes at Greek banks as long as capital restrictions remain in place, a deputy finance minister told Greek television on Sunday."
http://www.zerohedge.com/news/2015-07-05/eurogroup-shock-finance-ministers-would-not-know-what-discuss-after-greferendum-stun
That reminds me of when the US made possession of large amounts of gold illegal, and nobody could open a safety deposit box without an official there to check it didn't contain gold. The Greek government will no doubt force Greeks to open their safety deposit boxes in front of an official, and deduct 30% of any money in there for the bank's bail in. They would have been better off buying Bitcoin.