Luckily mine is beautifully put together. I was inspecting it with a lighted jewellers loop, it looks like the bottom and sides are probably put together first then the top, speaker grills and screen are added later. The top edge of the sides, where they mate with the screen look like the have a slight taper/bevel on the edge. This can appear to be a gap. However most of the photos I've seen look like legit gaps.
I'd return mine if there were obvious gaps.