It seems like you're stuck without any further answers ATM. Not until the UPS inspection is completed anyway.
Once that's done, go from there. Since the original packaging wasn't used, I would think UPS would deny any liability in the situation, and put it back on the seller. 🙁 From that point, it would have to be handled through eBay, and their track record isn't the best from other posts in the forum.
That's why I was wondering if you would be inclined to repair it yourself. It might not look pretty, but would allow you to use it, and avoid the cost of a new case.
Hopefully, UPS would accept responsibility, but the packaging I think is going to really cause a problem. 🙁
Sorry things haven't yet been solved. I'll keep my fingers crossed. 😀
Good luck. 🙂