I'm not versed in anything like that, so I can't say either way

I do think they have a lot of contact with the outside world (That or the situation is more extreme than we think, like everyone's in space or something), I'm just trying to find evidence for exactly when the last contact must have been.

Plus, in Season 2 there was the Dharma supply airdrop - so someone is still thinking something is going on there, clearly. That could be a lot more extensive than we think.