For example, Kahn 1967 text The Codebreakers - The Story of Secret Writing has "... Cavite (sic Corregidor) was spottily reading JN25 messages ..."
NSA historians Gish and Parker each say "some" meassages were read, you might excuse "schedules" as intelligence - I, for one, would not.
Another example, Safford, in his Exhibit No. 151, has the US exchanging technical information and "translations" with the British. That is, translations of Japanese into English.
Wilford has STATION CAST establishing a section to link "C.I." and "R.I." materials together, ...
The above are just from American sources; the British and Australian Archives also have relevant matterials.
It all comes down to whether one believes that the IJN code was decrypted before Pearl. I’m skeptical about that, but it is the kind of thing that would remain classified for 100 years.