I assume you've found the "order" they're supposed to be in. I've got the first one lit, not the second, can't find the third (either), tried (I think) every possible permutation for the fourth, without success (unless there are 8 possibilities each, instead of 4, in which case I'm not trying to solve it sequentially anymore), can't get the fifth (though I didn't spend much) time on it, and can't find the sixth.
That's where I am. Also got the headlights, though I don't know why.
I've found a couple of supposed hints for the mailbox, but nothing that will "solve" it yet.
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