Zombie head
Hild's chest was removed from RuneScape after Update:Ninja Fixes to Invention - Live Stream Info - Other News, but still exists in-game for those who had obtained it.
[FAQ] • [doc]

Hild's chest is an item used in Meg's cases. It is found in the upper room of Lowe's Archery Emporium during the One Small Theft case. In the case, Lowe stole the chest from Horvik, who in turn stole it from Aubury, who initially stole it from Hild. The chest must be returned to Hild to complete the case.

More than one chest can be obtained from Lowe's crate even when in inventory, though it serves no other purpose.