So I placed an order for some stuff yesterday on the Nucleus market and it was waiting for the vendor's acceptance of the order. But now when I look in my account, it just says it's finished; no other information is in the "accept orders" or "sent orders" category. Does this mean he accepted my coins and is ready to ship, or did I get scammed?
This is precisely how FE orders on nucleus work. It's a bit confusing. Your order went through OK.