[nomi011]

Which method should I use for the refund to be done with under Nike's $100 shoes?

DNA It.

DNA it's the best for that type of price range?
What about signing, should I just fake sign it? With a fake sign, it turns out to be easier to perform a DNA right?

yup ill be doing DNA. I guess sign doesn't matter in this price range

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If the value is relatively low you could probably get away with an EB. I claimed EB on an order worth around €220 and they denied it at first after checking the weight, but I asked for an escalation and they processed a refund almost immediately. I thought it was a fail until I got the refund email. lol

DNA is more reliable, but the investigations tend to involve the carries, which can lead to other complications.

Damn! You are luck haha, but also it varies from country to country, for some countries they cross check weights and take investigations seriously, However for USA I saw they just refund immediately.