Yes, even if you've swapped your old MBs for new ones, your original wallet still exists and you can export it until February 2027 to recover your $EARNM.
Follow the steps in this FAQ article to do so.
Note:
Swapping MBs is a simpler, optional path for those who prefer not to handle crypto or wallet exports. If you had few boxes, the swap option offers bonus points and new boxes without extra steps.