yes knowing the rules is important but the reality is Thai airport immigration rarely asks to see the cash. I have never been asked in 20 years of travel to Thailand.
If your friend applies for a 3 month Non O in his home country, he can open a bank account without an agent, then deposit the 800k and apply for a 12 month extension in 2 months of his entry.
"Financials" generally refers to the financial statements and reports that provide a summary of a company's financial performance and position. This includes documents like the income statement, balance sheet, and cash flow statement, which detail revenues, expenses, assets, liabilities, and cash flows. Financials are crucial for stakeholders to assess a company's profitability, liquidity, and overall financial health.
you may be asked to show a return ticket within 60 days by your airline and/or Thai immigration. If asked, you could buy a throw away ticket from Thailand to any neighboring country (Malaysia, Laos, Cambodia). There are also online sires where you can buy a dummy ticket.