This seems like something the Commons Volunteer Response Team (VRT, previously OTRS) can help with. You can send them the documents and they can vouch that they

This seems like something the Commons Volunteer Response Team (VRT, previously OTRS) can help with. You can send them the documents and they can vouch that they say what was claimed, but without having to publish the material against the licence. I have used this for license confirmations, not for fact checking, but they do Biographies of Living Persons work so they might be able to help.