"Bats in the belfry" is related.
I literally have never, ever heard anyone use "toys in the attic" except for the album already mentioned.
I've never heard it in BrE, even as an album title. It's always been "bats in the belfry" here.
In this case liking Barb_D's posts is insufficient. I must add that I also have never heard "toys in the attic" spoken, or read it except in the album title. I am a native speaker of AmE aged 68. I also think that the COCA has zero occurrences of "toys in the attic", but I may be mistaken because I am not an expert user of the Corpus.
There are far too many RESPONDENTS to quote here and far too many novels, etc. to state here where this idiom is used.