retrieve merged computer

Server version: 2.9 - debian 11 - mariadb

Agent, 2.9 (on windows)

I have some test vm with the same virtual mac (not the one actually used for connections); so OCS show me this computer as "duplicates per Mac address".

A workmate, wrongly merged this few machines, question:

1 - is there a log which show me the name of the merged computer?

2 - is there a way to return to go back before the merging operation?

Thanks

(no info in osc-inventory/activity.log)