I can tell because of having seen some edges in my time.
Well, was it?
Probably nothing as severe as the plastic blister package on the Riovolt MP3 player I opened a decade ago.
Kitchen scissors wouldn't cut it. Sheet metal shears were unavailable. So, I used the well-honed 6" blade on my Gerber pocket knife.
In these days of attractive cardboard packaging for with warning labels for overly-sharp boxes, I think the thing that I miss the most is the part about cleaning the blood off of the new shiny toy after applying a tourniquet in barely-late attempt to minimize splash damage.
The modern out-of-the-box experience is, frankly, quite lacking.