I know I'm late to the party, but C. Hafner is definitely not of low reputation. They are on the LBMA "good delivery list" for gold. Founded in 1850, they have a long standing history. With an annual turn-over of around 1.5 billion AUD, they're also not exactly small. There's no reason not to get their gold bars in my opinion. And gold is gold, it doesn't really have a memory of being "recycled". I would even say that recycled gold should be preferred, as it is the most ethical option, as explained on their own website
https://www.c-hafner.de/en/company/responsibility.html