Seller canceled order, I was refunded now I'm getting shipping notices.

About 2 months ago I bought an item on eBay and the seller canceled it although I'm not sure why. I was refunded my money. Last week I got an ebay notice that the item had been shipped. Today I got an ebay notice that the item had been delivered. I figured it was some sort of Hiccup in their system. But I got a notice today from the post office today a package had been delivered to my mailbox, the same time stamp as the eBay notice. However, there's no package anywhere. I haven't purchased anything in a while, not expecting anything. What do you think is happening?