It's not perfectly ideal that box have ended up too deep like that, but it happened often with US boxes in production, only then you never noticed.
To solve it yourself, you could just put something just thick enough with a drop of glue in the front and rear parts of the box. A small stainless steel washer, fx (or a few to get it just right it they are thin). I used that trick in some custom MT boxes I had that were to deep and it worked well.
Of course, if you don't like to handle this issue yourself you can always bring it back to the dealer and let them have a look. But I would just use that "washer trick" and then be able to sail right away.
I hope it will work out well.