I'm not sure whether you are referring to one of the upper shells, or the lower box, and maybe it makes no difference. At any rate, there is a corner molding on the outside that you can remove by slitting the caulking and pulling a bit. When this if off, you can see the construction and joining of the corner. On mine, anyway, this exposed the heads of some bolts that held the back wall to the sidewall. I was able to simply tighten the bolts, but I suppose the threads could be stripped, in which case you will replace them with same length (not longer!) but next larger diameter. Replace the modling and the caulking.
By the way, I had mine open for a different reason - the walls were not coming apart.
Bill
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Shell coming apart
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