German WWII Soldier’s Grave Found in Poland with Mesolithic Tools, Roman and Byzantine Coins, and Other Artifacts

Looting, a popular past time of all soldiers.

Anyone who uses the term "German WW2 soldier" is a Nazi apologist.

"German WW2 soldier" is the term used by the Polish archaeologists who discovered the site. If they're OK with it, the morality police can probably stand down.

The article says that the coins likely belonged to the solider because they coincide with areas of likely deployment. The rest of the stuff was just in the area and there's no suggestion the soldier even knew about it. They just stumbled on it by accident because they were investigating the soldier.

The Nazis were a political party and the article does not mention him being a part of the S.S.

And to answer your second question - Nazi time travel.

Honestly, I do not doubt many things were pocketed while digging trenches. These do not look like looted items. Zzz, too sleepy.