
Well at 16 to 20 weeks I would not want them to be confined to a puppy pen but be going outside to toilet and being actively house-trained, contained at night fine, but not at this age as a matter of course.
Certainly I would be wanting reassurance that pups have been going for walks (individually), been to training classes, be that ring-craft or pet obedience/puppy socialisation.
I kept a puppy from my last litter here to 13 weeks when she was exported to Australia and spent 30 days in Quarantine. She had been going for walks for the last two weeks before she left, and had been carried about before that. She has been shown for the last month and a half (they have classes from 3 - 6 months), and just turned 6 months on Friday.
She came out of quarantine with hardly a blip, and her housetraining was well under way.
Basically the pups should have been leading a normal life, not had their lives on 'hold'.