Short answer: No.
Long answer: *Mule uses zlib compression (zip), when sending files, which can lead to much improved transfers, since many files compress rather well. This means that you often can have files that are completed with Completed > Transfered.
However, in this specific case, I'm willing to bet that the file you are downloading is a fake, since such high compressions ratios almost always are found in huge, but empty files.