This is assuming your Master workbook will only have one column of info to the right of column A, based on the sample you have given.
Open only the clipnumbers file, which contains macro, and you can run it directly; or click the button I have added if you have no idea how to run macros. Please look up on how to run it if you don't know how. Once you run the macro, it will ask you to browse to your Master workbook.
Matches found will take the info directly from Master workbook, non-matches will have the cell highlighted in red.
Sub EF1333410()
Dim i As Long, r As Range, s As String
Dim ws1 As Worksheet, ws2 As Worksheet
s = Application.GetOpenFilename("Excel Files,*.xls*", 1, "Select 'Master' Workbook")
If s = "False" Then Exit Sub
Application.ScreenUpdating = False
Set ws1 = ActiveSheet
With Workbooks.Open(s)
Set ws2 = .ActiveSheet
With ws1
For i = 2 To .Cells(.Rows.Count, 1).End(xlUp).Row
If .Cells(i, 1).Value <> "" Then
Set r = ws2.Cells.Find(.Cells(i, 1).Value, lookat:=xlWhole)
If Not r Is Nothing Then
With .Cells(i, 4)
.Interior.ColorIndex = 0
.Value = r.End(xlToRight).Value
End With
Else
.Cells(i, 4).Interior.ColorIndex = 3
End If
End If
Next
End With
Set ws2 = Nothing
.Close False
End With
Set ws1 = Nothing
Application.ScreenUpdating = True
End Sub
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