just my opinion
but if i see it on ebay and the box is sealed then i would expect to pay full price
if the box was unsealed even if the seller said it was unused i wouldnt expect to pay full price as opened still means second hand--or you have to trust the sellers word its new
but not going to do that if they wanted full price for unsealed you would just go to another seller and get a sealed one
just my opinion though others may think differently