Sliezbykt's Cabinet is always filled with things. When he removes something from it, something else will appear in the empty space.
When is always a mystery as it could be the very next moment or weeks later.
This random refilling has cause him to stuff the other shelves and cupboards of his wandering shop as the things removed from the cabinet could no longer be put back.
The cabinet, which came with Stixzy his wandering shop, is the creation of Baba Yaga so she never had to bother leaving her chicken-legged home to haul her no-longer-amusing trinkets into storage. In order to keep more trinkets arriving, Sliezbykt must drop a portion of his profits into a magic coffer he can never open. This is something he does, though he often cries as his precious coins disappear. Still, the arrival of new trickets to sell will soothe away his tears.
Sliezbykt's Cabinet can only deliver new items that fit in the empty spaces.
The more items he removes, the better chances the goblin shopkeeper has of getting a magical weapon or piece of armor.
Such things are highly profitable so he works hard to make room in the cabinet. The wandering shop is small, though so finding the room is always a challenge.
I love that your magic cabinet is itself a container to show off your other curiosities!
Thanx
PANGORIO
andHYPNOSIUM