The money train robbery wasn't even that big...
They got around $3 million. That's nothing to these major drug organizations that import large quantities of heroin and cocaine. They would look for the thief of course, but it wouldn't turn into this huge manhunt that would draw lots of attention.
When they hit the money train originally, I thought they had ripped off tens of millions. And that's why it was such a big deal. You see drug shipments that make the news seized that have far, far more than that. Well into the tens or even hundreds of millions of heroin/coke in a single load.