Kept mine, but I doubt they'll ever be used for anything. When they bring Necrochasm into year 2, they should make you do the whole quest for it again instead of being bought from the kiosk. Y2 Husk of the pit from taken champions. New embalming orb sold by Eris for 50 hadium flakes. Crux of crota dropped from a Y2 revamped Crota's End. However, you can also buy each of these items from eris for one box of raisins each, to reward those that saved them.
Bump Mother-blam!-ing Bump