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I know a lot of people dont but you should be checking fluids once a week and then include all drive train fluids at least once a month. Pushing the service out can result in oil being burnt depending on the type of driving being done.
I wouldnt worry to much about any of that. I have pulled rear filters off that are clean and havent had oil through them but I have only really seen this when a lot of highway driving has been done. If all is sounding normal and the oil usage doesnt continue then it should be fine. For what its worth my engine doesnt use any oil in 5000km.