foreach ( $system as $sysFile ) {
	$this->EfsFile->contain();
	$found = $this->EfsFile->find('first', array(
		'conditions' => array(
			'EfsFile.filename'=> $sysFile['filename'],
			'EfsFile.project_id'=> $current_project_id
		)
	));
	if ( $found ) {
		// OK, this file exists already
	}
}