I am just curious, but would a FOI request work for a current/open/active investigation? Seems like that would be a very exploitable process (by the "bad guys") if it would.
Judges issue sealed warrants. My understanding is that an FOIPA request would acknowledge the existence of a sealed warrant and affidavit after they're executed though, unless they're part of a multi-part warrant. Search warrants expire in a matter of days. Since some or all of the hardware seems to have been returned, there's no reason for it not to show up in a properly worded FOIPA request.