If you guys were to go out and buy an iPhone or an xbox or any other piece of electronics you would expect that the reseller, such as Walmart would NOT open the package to upgrade your phones firmware to check to see if the charging cable is there or whatever. They are a reseller and as such it is not their job to open up packages for any reason. Their job as a reseller is to resell the item. The manufacturer is responsible for ensuring that everything is in the box as it should be. No one here would ever buy an open iPhone and as such I do not expect anyone to buy an open oscilloscope that has been advertised as new. New means it has been sealed and untouched by the reseller. Period!
IPhones, x boxes, etc are consumer items & are pretty much "complete in themselves", needing very little in the way of peripherals to work, unlike oscilloscopes with probes, etc.
Importers/ resellers often open equipment boxes, replace inappropriate power cords, check probes for condition & function, etc.
They also commonly check the device itself is functional.
This probably comes from the fact that, historically, the buyers of test equipment were large users of Electronic equipment, who wanted a functional unit, & didn't give a hang about getting a "factory sealed" box.
A non-operational unit is a loss of money to such organisations, as they are unable to use it in their business until it works.
It is/was not uncommon, in such places, when encountering a problem with a new piece of equipment, to "open it up" to check if the problem can be easily fixed "in house".
With customers who are worth "big bucks" to a manufacturer/reseller/importer, the likelihood of that invalidating the warranty is miniscule, both because the techs & EEs know their stuff, & won't just blunder around inside, & the definite possibility that your competitor is quite likely to be more obligin