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Moving my chickens has never put them out of lay, not even for a day or two. So my guess is the seller's hen's have been slow starters. He may just not want you to expect eggs too
soon, from young pullets.
I've usually moved chickens at night. Take them off the roost at the old place, put them on the roost in the new place. They wake up in a new home, new nests to explore, fresh straw on the floor, they love it. I keep them closed up the first day, if it's the whole flock, then let them out to range after that. If it's just a few new birds, I let them out with the rest the next day, they follow the old timers in at dark.
It is recommended to quarantine new birds away from the rest of your flock, for a couple of weeks to a month, to make sure the newcomers are healthy before you expose your old birds to them.
What breed are they? Or are they mutts? Some breeds begin to lay at around 20 weeks, others may take nearly a year to start. Some of my pullets from this spring just started laying abut a week ago. They were early spring chicks, and molted before they started laying. Yours might go through a molt before they lay. Some of my other young ones don't seem to be molting, but it's not always obvious, if they are "slow molters", shedding and replacing only a few feathers at a time. Others look like they exploded.
I'd say just leave a handful of golf balls in the nest boxes, and don't worry about it. Seeing egg-ish items before they're ready to lay won't do any harm. Seeing eggs may actually trigger the production of hormones that start them laying. Some hens do get a hormone shift triggered by the sight of a nest full of eggs, that causes them to go broody. That won't happen until after they start laying, though, and with most hens (note I said most, not all, there are always a few oddballs around) they won't brood in the winter.
Whenever the hormones kick in, and they get the urge to lay, the sight of the fake eggs (or golf balls, or whatever) will be a visual trigger for their instinct to lay in a darkened, sheltered, spot. They might lay outside the nest the first few times, until they figure out what's happening. I give them a 16% protein ration, but not layer feed, until they start to lay. Then switch to layer feed.