Where do the plastic boxes for screw containers come from?

Screws are one of the earliest things you gain the ability to produce in Satisfactory, and boy do you ever need to produce them! They're likely to be one of your main bottlenecks for quite some times as you climb the tech tree, and you'll quickly become more familiar than you ever wanted to be with the sight of the big blue plastic containers holding a bunch of screws.

Thing is... it's not until several tech tiers later that you unlock the ability to produce blue plastic, once you get oil and refineries. So where were all those boxes for all those screws coming from in the interim?

Solution 1:

Here are the few solutions I was able to come up with after a while of thinking:

1. The boxes are made of some sort of metal. Although an unlikely choice, there is a chance that the boxes are made of an unspecified type of metal (such as iron). However, it is the same color as the plastic boxes, which concludes it to be unlikely.
2. The HUB came with some metal boxes that are unseen. This is a bit of a plot-idea, but think about it; you need organization when you are trying to start factories on a new world! Perhaps the HUB came with some plastic boxes stowed away somewhere to help you clean up your mess.
3. There is no answer. Sometimes, random materials can come out of nowhere in video games. This is probably the most reasonable option and happens in many games, such as Minecraft. (Where in the world did those iron crafting table tools come from?)

But, these are the only logical solutions I could think of.

Solution 2:

Two of the first buildings you make have the screw boxes.

They can be found in the Equipment Workshop.

They can also be found in the Craft Bench.