::: Interesting question. The only explanation I get is that they were "inexplicably destroyed". Whether that was done deliberately or not is not clear. But before we start entering into conspiracy theories, we need to understand the mentality of the British at the end of the war. A lot of the British National Archives were gutted and some valuable documents were lost, either through carelessness, or because some bureaucrat in White Hall didn't see the need in keeping them or they took up too much space. The papers of Trafford Leigh-Mallory is a prime example; which is a shame because his approach to air operations is misunderstood and his papers would have served researchers well. So they had form for this kind of thing and I wouldn't regard it as 'hyper-unusual'. I understand that both Lindemann's and Lütjens' service records were reconstructed from the files of the Deutsche Dienststelle in Berlin in the 1950s. Perhaps this averted historical disaster?