Well its been discussed time and again the fate of balors head. However I have yet to read or hear any mention of what become of his body, his armor, and his magic sword.
Directly after Balor's defeat, the Fallen Lords lost much of their power, however that does not preclude one of them (Soulblighter perhaps), taking the body and secreting it away, perhaps in the Kingdom of Gower.
This raises the question of wether or not Balors sord has any magic value unless he alone weilds it.
Additionaly, is the suit of armor he wore, the suposed magical armor that the head had alric looking for back east, and if so, is it any good without the helmet.
in any event its doubtful balors body was just left to rot after its death at Rhi'anon.