Keep looking for a howto in that case.

I sure wouldn't want to try to split one of these at the seam, the wall thickness where it's chemically welded is considerable. The latch appears to be molded into the bottom section and the seam between the two sections runs around the corner from front to side of the 5300 and is part of the main visual dividing line between top and bottom of the case design.

Good luck with that!