1. A method comprising: receiving information indicative of an encounter between a robotic vehicle and an object responsive to communication received from a sensor of the robotic vehicle while the robotic vehicle transits a parcel; determining a location of the robotic vehicle at a time corresponding to occurrence of the encounter; determining whether the location corresponds to a location associated with a known object associated with the parcel; and classifying the object as an unknown object based on the location not corresponding to the location associated with the known object.