Are the locations of blueprints fixed or random?

[Tahnval]

I've been after a specific blueprint (wooden floor tiles) for some time now. I've nearly cleared nearly all POIs. I'm curious as to whether each blueprint is in a specific location and I've missed that one or if the locations are random. Either specific containers having a random chance of containing a blueprint or not or specific containers always containing a blueprint but the blueprint being randomly selected. I think I've found the same blueprint more than once.

[Error 404 Not Found]

i believe its random, iv played on t games one i hosted and another someone else hosted and noticed blueprints are random i took not of where the one of the boat blueprints were and when back in the new server it was a different blueprint

[myk]

I believe somewhat random. Level of blueprints and level of POI.

[stretch]

They seem to be semi random.

If a container can drop a blueprint it has a specific pool that it can draw from and once that pool is exhausted they will stop dropping anymore. You need to learn the blueprint for it to stop dropping and until you do you can get the same one repeatedly. Once you learn that one it moves on to the next one. If you got one twice it's because you had not memorised it yet and you will keep getting that one until you do learn it. On the warehouse island there are two very easy to get to containers that are great early game sources of blueprints and I have gotten the same one from both simply because they were so close together and I didn't learn the first copy fast enough.

Containers seem to have different pools depending on the location which is probably related to the tier of enemy nearby. In places where there are no enemies you seem more likely to get furniture and in higher tier places you will get more things like vehicles. That's just an example and not a rule since there might be many factors deciding what a container can drop but hopefully you get the idea. There might be exceptions but generally if you want a helicopter you need to go to the hardest enemy location and if you want a couch go to an underwater place with no enemies but that's a pretty massive generalisation as the pool it can draw from is not that well defined. I think something that can drop a chopper can drop some of the items of furniture too but the easy to get to ones will never drop a heli.