Best place to sell a unopened form1+

My project fell through after I upgraded my Form1 to a Form1+. That Form1+ is still in the unopened shipping box. I also have a lot of unopened resin and the barely used stuff like spatula etc.
Question 1: where are the best sites to sell this equipment (I live near Washington DC)?
Question 2: How do I know if the form1+ is new or just my form1 upgraded and refurbished?
scott@eleff.net

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