This might be a little late, but it may be worth the tip:
There is a check mark in the Wingdings font that you can use on a report.
Place a textbox control on the report, set its Font property to Wingdings, and then place the checkmark into it.
Leave the original checkbox control on the form, but set its Visible property to No to make it invisible.
(You may need to first insert the check mark symbol into a Word document and then copy and paste it into the Access textbox’s Control Source property, using the syntax ="ü" CharMap.exe used to do this also.)
Make the check mark visible only when the Yes/No field has a value of True, open the report Detail section’s Format event procedure and enter the following code:
Private Sub Detail_Format(Cancel As Integer, FormatCount As Integer)
If Me![FieldName] = True Then
Me![txtCheckmark].Visible = True
Else
Me![txtCheckmark].Visible = False
End If
End Sub
(Of course, substitute [FieldName] with your checkbox field)
Hope it helps