Semi,
I would just call Cabela's and ask to talk to a customer rep., explain your dissatisfaction with the scope and why. I have always had very good luck with Cabela's Customer Service. I would'nt be surprised if they send you a pre-paid shipping label and credit your account for the full amount. They will probably place your undamaged and little used scope in the "Bargain Cave" department of one of their retail outlets.
BPS