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