Legitimate businesses have offsite digital backups of customer transactions. Good businesses have multiple sites. I'm smelling a scam, here. It wouldn't surprise me a bit if most of the money has already been wired to untraceable foreign accounts.
Effective FBI agents seize not only primary records but backup records, execute their raids on all business locations at the same time, and simultaneously serve asset freeze and injunction court orders against any service providers which store the target business' data, records, and funds.