Очень похожая была ситуация.
Закачал кучу фоток, акт с почты о доступе к вложению и разнице в весе, официальный ответ с Главпочтампа что будут расследовать...
Но вот решение по диспуту...
We have concluded our investigation into your claim detailed below. We
regret to inform you that we were unable to resolve this case in your favor
because the claim was incomplete, filed incorrectly, or outside the bounds
of coverage as defined in our User Agreement. As a result, we have not
taken any action at this time.
Please be assured that this case has been noted in the seller's record for
future reference.
двести баксов тю тю...