The standard approach here, I believe, is to use the Catalog of Copyright Entries, which is relatively standard, though potentially not infallible, being hand-generated by bureaucrats. If you check the relevant dates, there's no renewal shown for those books.
What additional information do you have on your side? Dates? Scans?
Also, rather than blustering into a public forum and denouncing everybody for violating (based only on your unsubstantiated claims) the law, perhaps you'd be better off starting a private discussion with one of the administrators around here.