Need recommendations for a person/company that can trace the funds at that time and confirm they were actually sold for fiat.
You can try a
special service from Chainalysis, I've never used it and this is the first time I've heard of it, but this service looks legit and promising. They're also on
Trustpilot with few reviews.
Following your topic from a while ago, I hope you can get it right and what you should actually get. I'm no expert, but feel free to shoot me a PM if you need some advices.