Remove those files?
If you did a full scan and all the other checks pass, then the system is probably ok, but you will need to determine that.
If you have any doubts about the server, rebuild it.
Here is the official guidance:
https://msrc-blog.microsoft.com/2021/03/16/guidance-for-responders-investigating-and-remediating-on-premises-exchange-server-vulnerabilities/