Should be able to just slide the box top up and off and plug it in while it still sits in the box.....if they won't do that at the store, do it yourself at home before you totally unbox it.
This is a good practice when you buy any set at any time, or any place to check for shipping damage.
I've seen quite a few sets that are shattered (cant tell until you plug it in) from shipping. even if the box looks fine.
(especially from Amazon)
They wouldn't do a screen check at the store, my Son and I did exactly as you suggested, actually was his suggestion that we plug it in before we Installed. We had to remove the cardboard protective from the screen, but left it sitting in the lower end of the box. Looked good, saw no black dead pixels. Got it set-up, ran new firmware update. had to resign into Max, Prime Video, and Sony account. Ran a 4K pixel test off of YouTube. Son and I got close we each took a side looking again for dead pixels on a totally white full screen all good. Just finished. Happy camper again.
@isolar8001 thanks for the tip and for chiming in. Very much appreciated guys!
I should mention it went smooth at Best Buy awesome service. Production date: March 2024 on this one.