Where do I find meth ingredients in the Bomb: Dockyard heist?

In the new The Bomb DLC for Payday 2 there is an achievement for finding the meth lab in the Bomb: Dockyard.

I found the lab in a container on the ship, but where is it possible for the meth ingredients to spawn and how many sets can there be? Is the number tied to difficulty level?

I have found some in open boxes (same as the open boxes in the Hotline Miami meth room) spread randomly around the level. I expected to find some in crates, but haven't found any there yet. Can they spawn there? Can they spawn elsewhere?

Solution 1:

The ingredients will spawn in random boxes throughout the level, and unfortunately it is completely random when and where they will spawn. It also seems that they won't always spawn (or, at least, that seems to be the consensus so far). There are quite a number of spawn locations to check, and the list seems to be growing, but they are in cardboard boxes. Here's a map of known locations at the moment.

You can also check out this Reddit thread which has some more information and videos and screenshots showing some of the locations. Here's a screenshot from that thread of what you're looking for: