Avamar 7.5.1 retired client are not in MC_RETIRED folder

I am new to Avamar. Unfortunately, I happened upon a version of Avamar 7.5.1 that can't be upgraded because of old servers to be backed up(Windows 2003, 2008).
I'm migrating the clients from the previous sub-domain(outdated HP machines) to the new vxrails sub-domain. After clicking on "retire client", I expect to find these Avamar clients inside "MC_RETIRED", but this is not the case, they are not there. As expiration dates, I chose to leave the existing ones.
I would like to know where the clients previously saved by avamar go when I decide to retire them.

Greetings