The person who once worked for companies X, Y, and Z is now be working for a different firm but nonetheless may retain memories of what happened at the previous employers.
Our hope is that the good experiences far outweigh any bad ones. We sometimes say that a person has "baggage." That term is never positive. Good baggage does not exist. The bad is a heavy burden that may never disappear. It can harm careers.
Stoicism teaches us that although we may not be able to control events, we can control our reaction to events.
If the baggage cannot be thrown away, it need not remain in a living room or office. The equivalent of an attic or closet will be a suitable area to reduce the risk of tripping over a bag that was acquired a long time ago.