Balance sheets are often incomplete and not verified by independent auditors. Many assets can be hin and show financials that dot reflect the real value of the company. This can be made on purpose, in order to avoid and delay investments repayments. Assets can be sold under value, to new companies made on purpose. The investor sitting usually on the other part of the globe has little chance to understand the "in between" the lanes.
Asset recovery is based on a private equity approach and requires a planned analysis of each aspect of the investment. Starting from bank accounts, over corporate transactions, loans, anything that matters need to be reassessed.