Per the EULA:
Within 45 days after the end of each calendar quarter in which a Product earns revenue outside of the above-listed royalty exclusions, you will pay to Epic the full amount of the royalty due for such quarter and send Epic a royalty report on a per Product basis.
Therefore, if the game earns $2800 in a quarter, then the Product does not earn revenue outside of the royalty exclusions. If that is the case, there is no obligation to send a royalty report.