The customer accepted your proposed / propose schedule
Today, even the spelling has caught up. Google gives these hits:
Results 1 - 10 of about 4,190,000 for "boxed set"
Results 1 - 10 of about 24,600,000 for "box set"
So "proposed schedule" has a medial /d/, but I wouldn't be surprised if some 22nd century linguist refers to the /d/ that 'used to be present in that phrase'.