$MissingPatchList{$BulletinID} = "$pad{(length($MissingPatchList{$BulletinID}))}$MissingPatchList{$BulletinID}";

# better written as:

$MissingPatchList{$BulletinID} =
    $pad{ length( $MissingPatchList{$BulletinID} ) }  
    . $MissingPatchList{$BulletinID};