The function you are looking for is File -> Source Control -> Resume Conflict Resolution.
While in this case the system worked correctly and did not actually allow the “AcceptTheirs” things behind you, it never hurts to be sure. I would not click the Check button if you are not sure that the merged files are in good condition.
In the worst case, change Merge again in another workspace, and then compare the results (without any manual merges) with the original workspace. This will tell you which files have and did not go through some kind of Resolve process that modifies the contents of the file.
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