No. If you return all or part of your order, it is no longer eligible for the reward.
The brand only validates the reward if the order is kept as is: payment confirmed, no item returned, and the brand's conditions met. As soon as an item is returned, the brand cancels its commission and the pending Wards are not validated.
Each brand's reward conditions are listed on its tab, in the Top Deals page.
See also: Why are my Wards still pending?