For example, if after the PC has smelled the object and tries to ‘Put newThing in box’. The command fails. But if the PC tries ‘Put strangeThing in box’ the command works as expected.
(I use addVocab instead of replaceVocab for QoL reasons, I guess that players should be capable of using the former vocabulary (which refers to the spatial layout of these furnitures in the location, so still makes sense to players)