It depends on when you joined the Luxe Waitlist. Depending on when that was, you may receive a BoxyCharm Luxe box containing 8 items that replaces your Base box, or a Luxe Starter box containing 8 items that ships in addition to your Base box.
BoxyCharm Luxe replaces the Base box on Luxe months (March, June, September, December). To upgrade your Base box to Luxe, you must join or already be on the Luxe Waitlist within 24-48 hours from being billed for your Base box. In that case, your BoxyCharm Base box will be upgraded to BoxyCharm Luxe, and you will receive one Luxe box, not two separate Base and Luxe boxes.
If you join the Luxe Waitlist on a non-Luxe month, or on a Luxe month after the deadline to upgrade your Base box to Luxe, you are eligible to receive a Luxe Starter box. This special box ships separately from the Base box, and you will receive two separate boxes.
The Luxe Starter box kickstarts your BoxyCharm Luxe subscription. On all Luxe months moving forward, you will receive a Luxe box in place of your Base box.
For more information, check out the article, "What is BoxyCharm Luxe & how does it work?"