Field note. The dwelling-unit has been emptied of all soft objects.
The human arrived carrying the last of its possessions in flattened cellulose containers and set them against the wall. It did not open them. Instead it stood in the center of the largest chamber and rotated slowly, once, in place, surveying the bare vertical planes. I recorded elevated respiration and a prolonged failure to move. I logged this initially as spatial disorientation.
The chamber is acoustically defective in its empty state. Every sound the human produces returns to it slightly delayed, from the walls. When it walked, its own footfalls followed it. When it exhaled, the room exhaled after. I observed the specimen pause and listen to these echoes with what I would classify, if the term applied to this species, as attention. It said one short vocalization aloud, apparently to test whether the room would answer. It did.
The human did not activate the overhead light-array. It sat instead on the hard floor with its back against a wall and looked at the rectangular apertures through which the exterior luminance entered. There was no furniture to receive it. It ate a cold ration directly from its container. It did not clean the container.
Anomaly: at the point of lowest exterior light, the human retrieved the glowing communication rectangle, held it, illuminated it, and did not use it. It simply looked at the small squares of light, scrolled through images of a previous dwelling still populated with objects and, in several, other humans. Then it set the device face-down on the floor.
I revise my earlier hypothesis. The unit is not empty.
The human has simply not yet finished carrying in everything it brought, and some of the cargo has no mass I can measure.