Does someone know to get the status of DXF dictionary for "Unused Layers"?

Does someone know to get the status of DXF dictionary for "Unused Layers"? I got Mr. Lee Mac's code was gave me an information of thawed/frozen/on/off/lock/unlock status of layers but How about an "Unused Layers"status for?

(defun [b]test[/b] ( filter / dict xdict )
 (if
   (and
     (setq xdict
       (cdr
         (assoc 360
           (entget
             (cdr
               (assoc 330
                 (entget (tblobjname "LAYER" "0"))
               )
             )
           )
         )
       )
     )
     (or
       (setq dict
         (cdr
           (assoc -1
             (dictsearch xdict "ACAD_LAYERFILTERS")
           )
         )
       )
       (setq dict
         (dictadd xdict "ACAD_LAYERFILTERS"
           (entmakex
            '(
               (0 . "DICTIONARY")
               (100 . "AcDbDictionary")
               (280 . 0)
               (281 . 1)
             )
           )
         )
       )
     )
     (not (dictsearch dict filter))
   )
   (dictadd dict filter
     (entmakex
       (list
         (cons 0 "XRECORD")
         (cons 100 "AcDbXrecord")
         (cons 280 1)
         (cons 1 filter)
         (cons 1 "#*")
         (cons 1 "3")
         (cons 1 "*")
         (cons 70 768)
         (cons 1 "*")
         (cons 1 "*")
         (list -3
           (list "ACAD"
             (cons 1000 "( NAME== \"#*\" ) and ( COLOR== \"3\" ) and LOCKED == \"FALSE\"")
           )
         )
       )
     )
   )
 )
)


(defun c:[color=red][b]TEST1[/b][/color] ()
(test "Group_1")
(princ)
)


(defun c:[b][color=red]TEST2[/color] [/b]()
(entget (cdr (assoc -1 (getlayerfilter "Group_2"))) '("*"))
(princ)
)

;; Layer Filter XRecord Data

The following list details the various DXF codes and values contained in the Xrecord:

1 Name of Filter
1 Layer Name
1 Color
1 Linetype
70 (Please refer further below)
1 Lineweight
1 PlotStyle

The 70 DXF code can contain one of the following numbers or an addition of them:

[b] ON/OFF[/b]
On 1
Off 3

[b] FREEZE/THAW[/b]
Freeze 4
Thaw 12

CURRENT VPORT
Freeze 16
Thaw 48

NEW VPORT
Freeze 64
Thaw 192

[b] LOCK/UNLOCK[/b]
Lock 256
UnLock 768

PLOT
Plot 1024
Don't Plot 3072

#sorry for my poor english..