I'm also pretty sure that you would have to take into the account, out of all the U-boats, and their crews that were lost during the conflict, that there would be ALOT of missing information. (ie) missing log books, communication logs, burning of official documents as the allies got closer and closer to Berlin. Quite a few of these reports for tonnage, as well as patrol history were given by surviving crew members, some of which were not in a command position.
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