Hello and thanks for requesting me.
It's one thing to vet a letter of intent, but no matter how legal a letter or a contract looks, the paper is meaningless if the lender is a fraud. You won't be able to find the company to enforce the letter when they run off with your $47,500.
An up-front fee is the #1 sign of a loan scam, and once again you're being taken advantage of. An FEIN is a US number. It is only possible for a foreign company to obtain an FEIN if the owner's principal officer has a US social security number. A foreign company telling you of an FEIN is more than likely a scammer.
There is a Donnar Holdings purporting to be based in Florida, but there is no such company registered under this name licensed to do business in Florida. I do not find Donnar Holdings among the regulated business entities on the British Virgin Island's Financial Services Authority website either. Rather than a FEIN number if they are a BVI company they should have a BVI Certificate number which you could verify here.
The West Indies are notorious for loan scams. You should not pay this money, and your safest bet for finding a legitimate project funder would be to stick to companies in Australia that are listed with ASIC.
Just checking in to see if you need more help or any clarification of my answer. If so, please reply here on this question thread.