>You don't even need the BOX keyword. Just the coords:
>
>@2,2 to 50,50

Too bad it doesn't work with the printer. I tried

Set Printer on
Set Device To print
@1,1 to 10,10
@11,11 to 20,70 color Rgb(128, 68,0)
Set Device To screen
Set Printer off
Set Printer to

and got a blank paper.