As you can see, the pack is sticking out from underneath the plastic, and when I move the plastic it came off completely without any struggle.
Do you think that it’s been removed from the packaging, weighed, and then resealed with glue? Or is it an innocent mistake where it’s an old blister that has degraded?
If you had been scammed I’d be more impressed with the ability of the scammer to separate the cardboard from the plastic. The fact that it looks clean with almost no pealing suggests to me that the adhesive just wore off.
We ultimately cannot give you a definitive answer. However, I would echo @cullers observation. I have had comparable sealed products do this on occasion due to age and/or weather.