Besides all the other red flags, what would have (probably) triggered an alarm would have been the actual list of equipment (and its generic content).

Set of furniture?

Copiers?

Graphics generator and software?

Data storage and Microfiche?

High speed Internet access?

All coming from a same supplier, the same that provides the Mac and the "Dual Monitors", maybe it is "normal" in US, but elsewhere there would be several different suppliers, very detailed confirm orders, a lengthy contract for the Internet access, endless back and forth for fixing delivery and installation dates, etc.

Microfiche in particular cracked me up.

I'm in my mid-30s and barely old enough to know what microfiche even is!

This named cross-selling in scientific marketing, when somebody sell to customer related items, even far related.

Best example, when You will buy auto, good seller will try to sell items for tourists, picnic items, spinning, and even bait (sure, will include regulated items in base, like insurance, fire-extinguisher).

I got you. I said "implied threat" meaning that someone who was having second thoughts before wiring the money is thinking about what could go wrong if they didn't wire the money, and not what could go wrong if they did. As others have mentioned there is also the whole sunk cost fallacy. This whole story is a great example of social engineering and it's the first time I've heard of it. Good for you to take the effort to post it. It's just long and could use a quick summary of the actual scam upfront for people with short attention spans.

Absent all the red flags, the basic form of the scam is pretty sophisticated. Here's a check to get yourself setup from our preferred supplier and expense it when you start probably should set off alarms to the degree that other things seemed off. But it's not by itself something a legit company would likely never do.