While the search warrants were being executed, servers belonging to Carpathia and leased by Megaupload were taken offline so that they could be properly forensically imaged.
Because of the large number of servers leased by Megaupload, not all of the servers were imaged by the government (based on estimates provided by Megaupload, imaging all 1,103 servers would have taken approximately 22,000 person-hours)