This is slightly off topic, but not really. Cats I've seen in emergencies do not react 'normally'. They get scared and flee, anywhere. They need about 24 hours to re-orient themselves. Possibly it's gone to a neighbours or back to its usually place in the building. Put out food for it--(not sardines) its usual food--and call for it now and then. Cats aren't very bright, but they aren't stupid, either.