[mothered]

Are you planning to purchase the PS4, and SE the company by returning the PS3?

yes ... but I already mentioned it in a thread previously

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I always try to advocate learning how to SE instead of refund when you don't have the funds. It requires no investment, though it is a bit more work than a refund.

I totally agree ... but I return the ps3 because it is broken XD

So the goal is to place the PS3 in the PS4 box and make it seem like PS4 box is unopened?

This Is also what I believe the OP Is referring to.

If so and the box Is perfectly sealed as per the manufacturer's packing and without any signs of tampering whatsoever, It has a pretty good chance of success. Of course, the Item weight will need to match.