Already know that command posts replenish ammo but do they replenish supply pips because if they do nothing would be stopping both teams from fully buffing everyone at the beginning of the match

As far as I know, they do not replenish Supplies.

I don't think so but if they did this would be a little jacked all a team would have to do is sit by one for a minute and buff the heck out eachother.

This is good but a shame was planning on light medic heal everyone and book it back to the respawn for another set of goodies

They can give everyone on your team a passive boost however like extra health or supplies!

They do not replenish supples. I was watching a video and after using one of his pips, he went to a command post to refill on ammo, and his supply meter did increase at all.