You were wise to keep the box and lit. as that makes all the difference in the world if you sell it. What it means is that you took real good care of your stuff. For a few years I bought and sold stereo equip left and right on ebay in an effort to get the best of the best.
I likes them Pioneers wif the purty blu lites. I even have a few of the accessory pieces for that series, which I wrongly quoted before. The 3700 is in the 4th series not the 3rd. I have a noise reduction and range expander as well as a reverb unit from that series. In fact, I have 2 of each, in the original boxes with manuals. I have them in both the blue lights and the green lights. My alltime preference though is from the 2nd series and my big time baby is my original SX-1250 receiver, 160 watts per ch. which I had a total makeover done on it last year and it will make your eyes bleed. You can see it here: