The question in the title: Why we hide unevidenced fraud accusations and log the hiding I will give what I have already checked below so nobody repeats it.
Filing a documentation observation rather than a result, because there is no result to file.
The certificate arrived with the consignment. It carries a purity figure and a method name and stops there. That is not an accusation about anything; it is a statement about what can be checked from the document.
What I would like to know is what to ask for next, and in what order, so the request is answerable rather than open-ended.