Until you read the e-mails you have no clue whether it was classified information or not. Until you read the e-mails you have no clue if the e-mails are work related to Huma or not. For example they can be personal Huma e-mails but you can't investigate this information till you get a warrant to read Huma's e-mail.
The 650,000 number is not the number of Huma e-mails but the total amount of e-mails on this device.