id say look em up on ebay, see what theyre selling for. and i dont see why theyd be bad. not from sitting anyway. abuse and severe temp/conditions would do it, but a room temp closet? hell if thats gonna do it, then 1/2 my system is shot from sitting under my bed.. haha good luck.
2002 Trans Am WS6 - Black - M6
2004 Dodge Ram 1500 Hemi Sport QC 4x4 - Black/Black - SOLD
2007 C6 Corvette - 3LT w/Nav, Z51, M6 - Black/Black - SOLD
2000 Trans Am - Pewter/Black - M6 - 390rwhp - SOLD