Hello @KEITHP1
You can excuse grades from the student so they don't show as missing, but you likely want those grades to populate. If the student was in another course, completed these assignments, and then was transferred to your course - the assignments scores need to be either export/imported from the previous course to this one. Or you can manually enter the grades for the student if you can get the school or teacher to provide their grades from the previous course. Additionally, if all of these assignments were done outside of canvas (an external app) you may want to check with the 3rd party where they completed them. There may be a way to get access or have the student's scores transferred over but you would need to speak with them directly.
In short, speak with your school. See if they can get the grades from the student if they were done in canvas directly or via 3rd party. Either manually entering their grades or export/importing them. Hopefully this helps.