Sales are only included after the Launch date/time set on the product. For instance, if you set the Launch date/time to July 20th 2017 at 2:34pm EST then all sales after this date/time will be recorded.
To find products that are on Prelaunch schedules, go to Affiliates > Find Products and click on Filters then check the box to show prelaunch listings then hit the orange "Search" button.
When you see the product labeled as Prelaunch, then the product is within 2 weeks of its launch date.
If you want Prelaunch sales to show you will need to adjust your launch date/time on the product.