Compare two string array and list what is not present in array 2

Hi all
Checking if cell has checkbox. I have an array of cell addresses from a range (MyArr) and I want to highlight what addresses do not have a corresponding checkbox

I can list the addresses in the array that have a checkbox

     i = 0
        ReDim MyArr2(ActiveSheet.Shapes.Count)
        For Each cb In ActiveSheet.Shapes
            If Not IsError(Application.Match(cb.TopLeftCell.Address, MyArr, False)) Then
            MyArr2(i) = cb.TopLeftCell.Address
            i = i + 1
        End If

but this doesn't give me the addresses that have no checkbox

     i = 0
        ReDim MyArr2(ActiveSheet.Shapes.Count)
        For Each cb In ActiveSheet.Shapes
            If IsError(Application.Match(cb.TopLeftCell.Address, MyArr, False)) Then
            MyArr2(i) = cb.TopLeftCell.Address
            i = i + 1
        End If

any ideas??