Unacceptable, BP, stand your ground on this one. Dead pixels are unacceptable, refurbished should appear as new, but have green sticker on them. Should be clean, too, but the packaging being different is also normal, but should be a Dell-branded box. If it was not a Dell-branded box, then something is fishy, IMHO.
to help, here's a link to Dell's pixel policy:
Gadgets, Phones, Tablets, Cameras, TVs, HiFi...NextPowerUp
-Only real men play games THIS way.