Sales are only included after the Release date/time set on the product. For instance, if you set the Release 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 Release schedules, go to Affiliates > Find Products and click on Filters then check the box to show pre-release listings then hit the orange "Search" button.
When you see the product labeled as Pre-release, then the product is within 2 weeks of its release date.
If you want Pre-Release sales to show you will need to adjust your release date/time on the product.