[mothered]

I suppose the amount of the orders are also important. If I use to make orders of $50 and suddenly with SE I paid an order about $300, it could be suspicious too.

Yes, of course.

My previous post Is non-exhaustive and barely scratches the surface. I can write an entire article on how to SE safely, but It's way beyond the scope of this post to do so. My blog contains a very In depth guide.

Could you confirm that even if the tracking postal notified that I received from the shops, I can use DNA method ?

Tracking/GPS Is a useless form of verification.

It only confirms delivery to an "address", and not "person-to-person", hence you did not personally receive the package.

I remembered that on AE, they asked me to proof that I didn"'t receive my package... It was funny ! How can I proof something that I didn't receive it  ?

They should've requested a denial of receipt form, a stat dec, or perhaps an affidavit to confirm that everything you've said about nonreceipt of goods, Is true and correct.