Don't know why yours doesn't. Mine has always and they are there still (using A2K).
If your report starts maximized, then the min/max buttons look different and are in a slightly different location than when the form is not maximized.
When the form is not maximized it looks like any normal window's min/max buttons. But when the form is maximized, the buttons are little tiny buttons that occur on the top line of the menu bar, all the way to the right, just below the Access Application Min/Max buttons.