[phobetor00]

I've done it before. 3 times with Amazon and I've been successful everytime.

Tips: Buy a scale because some items are slightly off if you go by Amazon's weight. Generally they are on point but just to be sure.

Call right after receiving the package. You want to make it seem like you just received the package and you're frustrated that you got the wrong item. 

They may or may not do an internal investigation (Happened to me once). if the weight of both items were very close, you'll be okay.

Buy the other item from another account that's not linked to you in any way. (IP address, name, phone, credit card. You know the drill)

Good luck.

Thanks Mitchel! Have you tried that with higher priced items, like over 1000€? I'm wondering if it can work in those cases as well.