Curious what method they used to gain access.
My guess is that they somehow were able to copy the information from the one phone to others and try up to 10,000 combinations of 4 digit pins until they hit the right one. Say they have 100 phones and 100 people given a group of 10 pins each to try out, its a crack the pin party at the FBI and you go until someone Yells Bingo! With 100 phones and 100 people, within 10 tries of 10 digit pins ( 100 pins per cracker ) they would be in pretty quickly, at the expense of 100 people hourly, plus 100 phones, plus whoever they hire to carefully extract a copy of the phones encrypted memory to clone to the other phones. Maybe the reason why it took so long is because they didnt buy 100 phones and someone was working around the clock cloning the phone and running a group of 10 pins and then cloning again and trying the next 10 and so on and repeat until bingo.... I wonder if Apple will increase the pin length to say 8 digits and make it that much longer to brute force crack by cloning the memory.
But the minute someone has physical access to your device its just a matter of time before they are in if they are determined and educated in how it all works.
