Superseded patches in baseline

Hi,
We release monthly baselines and we keep n-2 baselines in environment, n is current baseline month. Sometimes the components get superseded , hence the old baseline (n-1 and n-2 ) starts showing applicable with status of Superseded patches as unknown. It is caused by , source superseded patches are renamed or removed from big fix. For some business requirement we dont want to sync n-1 and n-2 baselines as well.

How can we correct unknown status of baseline components ? - We dont want to deploy baseline as well.
Why Bigfix client is not evaluating Baselines(n-1 and n-2) as it is ?