Statistics mystery - three magic numbers

Every file stored directly on DSP has three numbers in form of XX/YY/ZZ that describe download statistics.

DSP is a static site. All html files are created once a week (it is so called major update) and that day my software parses Apache logs. To increase download count of certain file downloaded bytes count must match its size. If doesn't it is assumed to be "corrupted" download and it doesn't affect statistics at all.
In case of files that have been updated upon "major update" I simply print statistics data in gray to indicate that these numbers refer to the previous version of a file.  

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