To be more specific, you can use their trade in tool to get a value and if it would be acceptable. Caveat, there is a lot of verbiage in tiny font when I scrolled down about the trade-in program. You can get up to 800 dollars off towards a trade-in. Also, the program is not offered in some states. For your phone cover, I get magic cover at the dollar store, and it's good quality too. Aside from the screen protector being bubbled up, I would think yes, they would accept it, however, you will ultimately get a definitive answer by using their website tool. It looks like a really nice phone I saw it in the store and was amazing. https://www.samsung.com/us/trade-in/?hl=en-US
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