You're also trending on social customs (i.e. it would look bad if they scrapped the new potatoes off your plate) which don't apply to the matter at hand. Think of a new example.
It wouldn't look bad to pick up the plate with the steak and potatoes. They specifically pick UP the steak and put it on a new plate. (I've had this happen.) The choice to leave the potatoes is a conscious one.
But ok...new choice.
I buy an IKEA table. It's missing 1 out of 26 pieces. I call them and ask them to mail me the 1 piece. They say ok.
2 days later an entire new box shows up with all 26 table pieces. Turns out IKEA thinks that's easier than stocking replacement pieces.
Ok, do I have to take the 25-peice set back to the store? I doubt they want something they can't sell. Did I
ask for all 26 new pieces? No. Should I be forced to pay for a whole new table when all I wanted was one piece? Certainly not.
In this case it's clear that IKEA wants me to throw the old table away. It's not stealing because this is clearly just how IKEA does business.
IF the OP is telling hte story right, it seems to me that this is Apple's idea too. Rather than keep a stack of replacement Macbooks they'll just send out the next one from China. Yeah, they lose a few boxes and chargers, but that's still
cheaper than keeping a stack of spare laptops in some warehouse somewhere and paying someone to watch them and send them out.
Just like my imaginary IKEA example, Apple has decided to do business in a way that is more efficient and saves money, even if it wastes a few little things. Since Apple made that choice the OP isn't responsible for telling Apple they're wrong to run their business that way. Apple decided it's better for the OP to have an extra charger than to maintain that imaginary warehouse. That's their call.
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I think 3-5 might be out of order. I think it goes
3) Apple sends replacement laptop, along with packaging to return the old defective laptop.
4) OP sends laptop back (without charger?)
That's what I'm basing my opinion on. Otherwise, if he already sent it all back and Apple said nothing. Then it probably means you can keep it without worry. They would have said something if they wanted it back.
Still, I might in good faith return it to the Apple store. You'd want Apple to show you good faith when it comes to your Applecare, no?
This changes my opinion.
If he decided to keep the 1st charger
before he got the 2nd one, I'm on the OP's side.
If he decided to keep the 1st charger
after getting the second one, I agree he should send it back.