When you say "worked", do you mean the phone worked in the microwave or that the microwave worked as a Faraday cage and prevented the phone from ringing?
They are saying the microwave and the faraday bag worked as a faraday cage.
The storage boxes and tool boxes did not function as a faraday cage.
They are saying the microwave and the faraday bag worked as a faraday cage.
The storage boxes and tool boxes did not function as a faraday cage.