Since pics are free on ebay.....now at least...there was a time they charged per picture...I would suggest that you always show front and back or in this case, inside and outside so that the seller sees exactly what they are getting as many dont read the listings carefully.

You can ask him to mail it back to you and upon receipt, you will refund him for the item. A lot of sellers dont refund shipping costs. I personally not only refund shipping costs but pay to have it sent back to me. The risk of not pleasing the buyer is bad feedback and future sales.