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Re:Apple Is Said to Be Working on an iPhone Even It Can’t Hack by lmm on Thursday February 25, 2016 @05:19AM (#11173493)
The "screwup" grandparent is suggesting is that the county didn't think to disable the setting that would let employees turn off iCloud backups for their devices, however many months or years ago, not that they've messed up during the investigation now.
Re:Apple Is Said to Be Working on an iPhone Even It Can’t Hack by ethbro on Thursday February 25, 2016 @07:21AM (#11173918)
No, they're probably referring to this, from the second letter,

"One of the strongest suggestions we [Apple] offered was that they pair the phone to a previously joined network, which would allow them to back up the phone and get the data they are now asking for. Unfortunately, we learned that while the attacker’s iPhone was in FBI custody the Apple ID password associated with the phone was changed. Changing this password meant the phone could no longer access iCloud services."

http://www.apple.com/customer-letter/answers/