[mothered]

And you were right. But before I get into that, I'll explain how I went about this.
Went home, used a heat gun to soften the glue and carefully lift the "sealed" edges. Took new laptop and charger and put it on a scale. Measured a 550g variance between the new and old laptop. Ended up bringing the  gram variance to within 60g. Sealed it up and went to store.
Lady asks, what's the reason for return.
I tell her the "person" I was gifting it to wants something else. She quickly looks at my seals( that I undone) and processes my return. In and out in 5 minutes or maybe even less.
What I'm noticing is in store SE's using the sealed box method, have an extremely high chance of success if you meticulously follow the steps.

I was always confident of Its success.

Thanks for sharing your experience. No doubt It will help members to SE under similar circumstances.