I'm looking to buy a used set of definitive speakers and was wondering if any knows the blue book of these.They are definitive technologies bp2002 with the 125 watt subwoofer.The seller says he bought them in 97 and used them for 4 months and they have been in the boxes since.He is asking $1,500 for the pair.I may offer him $900.Should I be concerned about the time they spent in the boxes?He also has a 2002 center channel that he got with the others which he is asking $375 for.Any advice or comments would be appreciated.Thanks