hello eekdyn
with missing objects is not always easy to identify the missing object because there are always different things to consider.
in this case either we have to go with the natural significator , which is combust by the way...so it cannot be seen, or accidental, or moon.
so to begin with first:
check the bathroom, toilet, next to water pipes, in a dirty part
of the house where rubbish or junk is kept, trashcan, a part of the house where it gets rotted or mildewed wash room etc
check the room where machinery and tools are kept as a storage room
check the kitchen, somewhere hot, mayby near a stove or something like that, or a lamp.also near a corner over there.
check near the entrance of your home(as an antiscion)
check also outside at the garden somewhere near a swamp, stagnant pool, locations subject to flooding, in or near a garbage can, near cesspools, a vermin infested area, next to an evergreen tree,etc