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Well, reporting false numbers as a public company can get you in hot water, so I do not doubt these companies are honest.

My guess is Sony reports only big round numbers because they are estimates. I believe they said "over 10 million" meaning they felt comfortable saying that, but not "10,132,649 units". This is likely based off shipments and percentages of shipped they sell. For example, if they've shipped 10.6 million they likely feel confident based on all data they have a 95% sell through rate then they can say "over 10 million sold".