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Yes it was
Yeah, return it for a full refund. Settle for nothing less than a full refund.
Normally, I would disinclined to buy any used gear without being to first hold it in my hands so I can test it. Your experience with eBay is the textbook example of why. Sure, you can probably get a refund. But, who wants the hassle, and who pays for the extra shipping to return it?
There are a couple of reputable online retailers that sell used Canon gear. AFAIK, they do not appear on either eBay or Amazon. They offer limited warranties, for up to 30 days. Sometimes, yoiu can find excellent deals on the exact itme you want. Never settle for your second choice.
The best place to buy "used" gear is the Refurbished Section of teh Canon Online Store. They gear is not necessarily used. My guess is that you see some custommer returns. But, all gear is fully tested and guaranteed for one year. Items come and go, in and out of stock. Due to the holiday volume, the most popular items are "out of stock". Be patent, and they will be back in less than a month, for at least some items, like your 50mm lens.