This is just a brief note to mention that we are indeed aware that OGR-28 stubs are intentionally no longer being distributed by our keyservers. This is because we have tentatively completed all of the minimum verification needed for the project, but we are still continuing to accept results from clients that still had pending work.
We will be posting a longer announcement soon, but we are working to finalize some details about the project so that we can include them in the announcement. Until then, feel free to allow your clients to continue working on RC5-72, if that appeals to you. Thanks again for your patience!