Great suggestions by all - thanks! Off to the Post Office it is. That's the way it arrived, so I have no druthers sending it back that way.

Gemini said they'd reimburse my shipping via Paypal, but I don't have a Paypal account. When you pay for things on Gemini's site you're taken to Paypal, but those of us without Paypal accounts just use a credit-card which Paypal processes. I'm curious how I'm supposed to get money from them.