Beautifull Luger and unknown origin. Please help me to figure out it.

[LUGER24]

My grandmother was born in Argentina in 1936, daughter of german family. Around 1945, a german soldier appeared in their farm at the Patagonia. He didn't speak spanish and he was severely dehydrated and exhausted. My great grandmother spoke with him, and he spent two nights under a huge ombu tree. One day when my great grandmother had gone to visit him, he was already gone nobody knows where. He left his his uniform and his Luger at the place with two bullets. Some years ago my grandmother gave it to me and I really want to know about it.