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Shadow1980 said:

Hold up. Weekly sales do get updated. They don't simply release the weekly numbers after the week is over. I know this because I've tracked weekly sales and I've seen those rankings change as the week progresses. For example, I was tracking the ranks of week 4 of June. I posted the preliminary numbers six days ago, and then the numbers were finalized no later than Tuesday).

And now that I think of it the Amazon sales weeks do run from Monday to Sunday, not Tuesday to Monday, so it'd be the week beginning on whatever date it shown. That's because the week 4 I'm talking about was the week of the 22nd. Now, if that was supposed to be the week ending the 22nd, then why would they still be updating that week's rankings eight days after it's over and done with? Seems more plausible that they finished that week on the 28th instead of the 22nd and it just took them a day or two for the ranking system to finalize the week's numbers.

They did update old rankings even from the last month due Cancellations, refunds, etc.