In order to make this thread useful, I'll also let others ask about objects they're not sure how to get - making it a general assistance thread, so that it's not completely useless after my own question is answered. That being said, I've been looking for some objects myself - namely, Outpost Small Airlock and Outpost Shipping Container. I've seen them used by players, but I could never find them myself. The only lootable outposts that I know of are the ones on cold planets, and those don't seem to use the small airlock, or the shipping container. Where should I look for these, exactly? =T
look on Frozen Underground biomes. I find a ton of these little human outposts, like the ruins you find on the starter planet but with different blocks/etc. I found a shipping container in one of those, once. I think that they're really rare tho, only ever found the one on like 8-10 different characters. I'm not sure if I have any small airlocks, but If they're anywhere, they're at those human outposts.
Also try looking on Frozen planets orbiting Frozen Stars. You can find plenty of outpost stuff on the surface of those planets.
Do the above, look on ice plentiful areas. If you see outpost block building generating there is a good chance that a building with a bin will generate I don't know of a airlock block tho, do you possibly mean Air Vent? Because if that is so, same place.
alternatively, you could always use /admin and /spawnitem [insertitemtaghere] ( https://starbounditems.herokuapp.com/ is a good way to find out what the item tag is). depends on how cheaty you want to be. nbd, it's an option...take it or leave it.