Seller claims item is new

I recently bought a Logitech Harmony 890 universal remote off of eBay. The seller claimed the item was new and in a sealed box. Well I received this item and it wasn't in a sealed box. It had been opened and used; they carefully tried to put the item back in the box. The listing claimed it was being shipped priority mail it took 8 days to get to me. So, I am already upset for making wait for parcel post. Once I found that the item was used I was livid at this seller. So I contact the seller and he says it’s virtually new and what is my problem? He said the item is in great working shape. I had a decision to make do I keep the item or do I return it? Unfortunately I’m not a very patient person when I decide I want something I tend to want it right now. So I ultimately decided to keep the item. It now has a couple of problems and I can’t return it to Logitech to get repaired. I guess I learned my lesson and will stick to the more reputable seller