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This one, right ?
https://www.guitarcenter.com/Musicians-Gear/Deluxe-SGS-Solid-Guitar-Style-Hardshell-Case.gc
That's a match which I was not expecting, and a gem of a deal in general, for a hardshell case for ANY guitar or bass !
So you were looking for a case which was not the proverbial rectangle ?
Please post pics of how yours lays in the case, and if you can get to a scale, also tell us what it weighs, empty.
And it's nice when those GC stores are so close that a person can just drop in and see what fits.
The closest Long & McQuade store [Canada's big music chain] is about an hour away from me, and any nearer locally based stores have very little stock/variety on hand, due to space considerations and their own budgets for carrying stuff.
EDIT :
I was just on the GC site again, and I would wager that this Epiphone SG HS case would also fit, if the one which you bought does :
https://www.guitarcenter.com/Epiphone/SG-Hardshell-Case.gc
It's a bit more, but not $700

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