Dashboard showing quarantine age and capacity - no messages in quarantine

On our SEA, (V4.5.3.2) that is part of a cluster of 2, the dashboard shows that there are messages in quarantine, and that quarantine is "~32%" full, and that the age of quarantine is 27 days

However, when I search for messages in quarantine, going back in time to before the SEA was purchased, no messages appear.

It seems suspect that there are messages somewhere that I can't find to remove. Does anybody have any suggestions?

Thank You