there are two filters you could use (first one for the boxes on the left hand side, the other for the ones on the right

/**allow order change - or indeed additional boxes - by filter**/
$box=apply_filters('wppizza_filter_reports_boxes_left',$box, $datasets, $range_restricted);
$boxrt=apply_filters('wppizza_filter_reports_boxes_right',$boxrt, $datasets, $range_restricted);

it should be relatively straight forward to add to the $box or $boxrt array depending on the dataset results i would think – just have a look as to what it’s there to start off with as a guide to what the array should look like
(i assume you know how wordpress filters work )