I used ‘ice box’ well into my thirties. And we didn’t need wiretaps on our party lines; everyone just eavesdropped on everyone else. LOL
If you ‘suspected’ Mrs Mcgilicuddy was listening in, just say something ‘dramatic’ about her and wait for the gasp from HER and all the others..then the ‘click’...
Without thinking I will STILL say ice box and am a tad older than 30....
Of course, all us USN types (well military) can have a conversation using the ‘old’ words and it is sort of cryptic... (Don’t pull a Clark Gable saying I had a ‘gay old time’ last night in the 1930s reruns)