387. A person is entitled to a rebate under this subdivision in respect of a claim period in its fiscal year only if the person files an application for the rebate after the first day in the fiscal year that the person is a selected public service body, charity or qualifying non-profit organization and within four years after the day that is(1) where the person is a registrant, the day on or before which the person is required to file a return under Chapter VIII for the period; and
(2) where the person is not a registrant, the last day of the claim period.