This to me is worse with older devices. Back in the 90s Apple wasn't overly concerned with the longevity of their products. So now a lot of old Macs and Apple devices have brittle plastic. What's a device like that worth now when it's NIB?I totally agree. Any electrical device that uses or has batteries in them has the potential for that battery to corrode overtime and cause a lot of internal damage. Has the cmos battery in that NIB machine corroded. What about the main battery, has it 'bloated' (cells damage causing the cells to swell). All of this is unknown because the box is sealed and because of that it's way way to much of a risk.
There are collectors out there who specifically target NIB machines who never have the intention breaking the seal but they are rare and it is more of a case of you finding them rather than them finding you.
Whilst 'sealed NIB' meant something many many years ago, in todays society it does not mean much because it is so easy to fake stuff. Look at what happened to Logan Paul recently with the supposedly autheticated limited edition pokemon boxed set he purchase, sealed NIB and it turned out to be a fake. There was also the reported incidents of newly released iphones being bought, the iphone removed and replaced with rubbish, resealed and being sold as 'sealed NIB'. The risks are too great.
No, like you, I see it as too much of a risk. I'd rather put down $50 for X item knowing that I am getting a working device. Anything that's still working now is likely to keep working. You can't know for sure if it's NIB. And who do you speak to if it doesn't work? Apple? The seller? The warranty is long expired and you have little recourse.
I know, it's a doom and gloom scenario. Most times things just work. But I just want proof is all.