Why did you choose not to blow the whistle?
The fake financial statements were publicly released: https://www.justice.gov/usao-sdny/press-release/file/1317641...
FWIW, I would wait on returning any money (or saying anything at all, really) + talk to a lawyer with experience in bankruptcy (their's + yours).
My guess is you can keep all/most of the $. They were fraudulent to you + the company is now evaporating. Sounds like you still need to pivot, but at least you can do so with $ in the bank and no black marks.