[Selficide]

I received a new figure today in the mail that I had ordered on eBay, it was for the new Marvel Legends 3.75" RAGE figure. Imagine my shock when I opened the shipping package and saw I had received a RAGE figure with the head from the ARMORED SPIDERMAN from the same series in an unopened or tampered with package. I checked the package VERY carefully and it shows no signs that it has been tampered or opened in any way at all. I am unsure if this is a common occurance or a rare thing, can anyone help me out here ??? Also I am wondering if a defect like this is worth anything ? Any help with this is greatly appreciated. Thank you.