"They missed a single reference. One of the first things we did on downloading the 560‑pages [PDF] was run a search on the word "Snowden" and lo and behold – on page 79, while noting that the entire record was under seal, up pops the email address "Ed_Snowden@lavabit.com."
As you can see from another page in the release, the redactions came thick and fast in relation to any mention of the NSA whistleblower, so the failure to notice a single reference to his email address is likely to cause some frustration in the FBI."
— http://www.theregister.co.uk/2016/03/17/feds_did_target_snowden_in_lavabit_case/