From what I understand they don’t hit the market all at once for a number of reasons:
It takes awhile to get it up for sale
They are trying to off the paper to another investor without a listing- they would rather sell in bulk this way, sell for less but move more
They don’t want to flood the market
It looks bad and is bad pr for their other primary banking units if they throw it all out there
Sorry nothing concrete there.
Even if they aren’t holding back, we do know there will be more defaults coming en masse.