Right. The top fits (or is supposed to) flush with the top edges of the sides. It is supported at the rear by a hidden pin hinge, and at the front by a small tongue that fits in a groove in the front side. So, if you looked at it with your line of sight parallel with the top and edge of the front, you would see a flat surface with a small (1/8") edge peeking up on the left side. I have sanded it a bit to make it less apparent, but I don't want to go any further as it will then look odd at the edge when you open it. The caveman approach might work, but I have a finish (tung oil) on it at this point so the water probably won't soak in.
Anyway, I'm 3 days overdue on my wife's birthday, so I'm gonna give it to her tonight and see if she notices. Man, you really start to get anal about this stuff...
-Jim