Files in Dedup disk folder older than retention period

Hi All

Running BE 2012 SP3, I've noticed that we have the Dedup retention period set to 2 days but when I look at the dedup data folder on the server I can see some files that are much older than 2 days (though the majority do fall within this period).

Any idea why this might be? - I've found the reclaim space TN which I may have to follow but am not sure whether it would help me in this instance.

cheers

Oldskoolskater