ccmcache holding old packages

Hi all -

We are in the final stages of deploying SCCM 2012 R2 in our environment and I noticed some older/superseded packages are persisting in the ccmcache folder. This is even for packages that do not have the persist in the cache option set.

I am assuming this is a bug, or based on some set time this will eventually go away. Does anyone have any information on this?

Thanks,

--Julius