In one outcome of this Roth-Roryn wilderness quest Shenjirra gives you the Andas Estate slave key and directs you to Aval Soldani as a aboloitionst contact within House Hlaalu. Aval Soldani however doesn't appear to have any dialogue or interations in this regard available (just a regular NPC) and the Andast Estate slave key cannot be used to free the slaves in the estate (they have no 'go free' dialogue option). Additionally, the estate key has a value of 50, which is unusual for a key (that normally have no value).