iphone backup on itunes

Hi, my iPhone 5 has serious water damage and cannot be repaired but I would like to restore its backup to another phone. But I cannot find the backup in iTunes as it only shows the connected phones. How can I find the 'unconnected' phones backups in itunes (since my iphone5 wont turn on). Also looked in the Library/mobilesyn/backup folder and the backups are for all my devices with no naming convention just large numbers.

iPhone 5, iOS 8