​New customer scam

We have a small B2B business in the food ingredient space. Last week we had an inquiry that immediately set off some red flags.

The main one being that most of customers take time to test samples before purchasing and he was ready to purchase $600k without so much as asking two questions.

He had a website with a bunch of stock images that was good enough to pass at first glance but also had some red flags. I asked him to send his bank references and trade references and surprised he actually replied back. He gave me an account number at Huntington bank with the bank representative phone and email.

Upon close inspection her email was @huntingtonbank.com even though the bank uses Huntington.com. I called the branch and there was no agent by that name and they confirmed that is not their email format. So obviously this guy had a pretty thought through scam.

Just wondering what is his end game and how would this scam play out if we didn’t catch it?