Hmmm.. My experiences with other INFJs, My own experiences and INFJ type descriptions tend to suggest that INFJs are minimalists rather than hoarders. However I am sure there are always exceptions.The INFJs I know are messy and slobby. However, they have their own bizarre cleaning rituals that they adhere to with military-style precision. The result is cleaning perfection/overkill in certain sections of their home and general filth everywhere else.
They also tend towards hoarding, which makes cleaning difficult and impractical in the areas where shit has accumulated.
I, myself tend to reserve my sentimentality for people and pets rather than material. If I have no use for something material, it generally is gone.