1. On the Amazon website, you can download the invoice (Rechnung) from the order page. Search for it, I think it's in a menu triggered by a small button at the

1. On the Amazon website, you can download the invoice (Rechnung) from the order page. Search for it, I think it's in a menu triggered by a small button at the top right of the order information. 2. In Germany (I think it's even EU-wide), never use the warranty (Garantie) of the manufacturer during the first two years of ownership, but use the Gewährleistung which says that Amazon (the seller) has to make sure your product works. If it has a problem, they (the seller) have to either fix it, replace it, or give you the money back, which is what Amazon does if they were the seller. It's a bit more cumbersome if you bought it on Amazon Marketplace (which I avoid for this reason) because then you have to get in contact with them and not with Amazon directly. They can also ship the board to ASUS to see if they fix it for the seller under warranty, but if they don't, then the seller must find an appropriate solution for you (replace or money back). They have to prove that you broke it (Beweislastumkehr) If you first tried it via warranty, you can show the seller the communication with the manufacturer to speed up things up for the seller, but you need to send the product to them. That the board is now lost is a problem, but they should have sent it with a tracking code. Then again, you say you bought it from Amazon US via Amazon Deutschland, which could be a Marketplace transaction and Amazon Deutschland could say it's not their problem, that you should talk with Amazon US. But even then Amazon US would need to adhere to the Gewährleistung, since it was sold in Germany.