Suspicious circumstances
Anyway, since he was in his shared room with Celine, he was in a private enough place.
But just in case, he decided to use one of the Spy eyes to keep watch around the room and make sure that no one came here by accident.
These were the same [Ageruus creeper's] eyes of which he had many in his possession. But calling them Spy eyes is easier on the tongue, so he decided to call them that from now on.
He liked those eyes very much, despite being a low-level magic item, they were extremely useful and practical. Just one of them was enough to cover a 200-meter radius!
Their utility to stick on walls and objects and become no different than a green stain was perfect to camouflage them.
Unfortunately this meant that each eye had to be stuck very carefully as they couldn't be removed and used some place else later. This was a fair deal since they already so useful already.
The first treasure chest contained many potions stacked in drawers throughout the big chest.