You can just check the quarantine folder remotely to see if the file(s) are still there from the 31st.
e.g. I Downloaded the McAfee tool and created a batch file which I then targeted the systems that had the false positive.
copy Standalone_Quarantine_Restore.exe \\%1\c$
psexec \\%1 c:\Standalone_Quarantine_Restore.exe
After the tool runs successfuly the files will be removed from the quarantine folder.
Hope this helps.