Sure, but even if it is, have the thing and the box or papers that were with the thing.
If you have an edentficasion
He does not speak Spanish. Sorry
It depends on what you want to return. But there are things that you can return without a receipt.
If sometimes they give you a purse
Yes, but when you return something without the receipt they sometimes give you less than what you paid and also when they scan it, they also know if it was bought recently or months or years ago ~ and if so, they do not change it and they do not return the money.
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