What two items did members of the annexe suggest destroying over the fear of the police being in the house?

On April 11 another burglary occurs. The men go downstairs to investigate and scare the burglars away by shouting "Police!" but this only draws attention to them. A married couple shine a flashlight into the warehouse and the men run upstairs. For days they all huddle upstairs, waiting for the Gestapo to come and take them away. The adults contemplate destroying evidence such as the radio and Anne's diary. Anne responds with fury at the latter suggestion.