I began the game assigned the "Blasto the Jellyfish Stings" box, which was level 1. I opened it on night one and got some text that google showed me was from an in-game easter egg from ME3 of the jellyfish gunning down people and saying "Enkindle THIS!", followed by being told that I had gained new information, followed by line breaks and then a statement that I had learned that the box didn't do anything. Late in the game, you may note that I talked about this because of the "Enkindle THIS!" line and felt that perhaps the box actually told me the scum kill flavor, since scum kills were shown as incineration.
At the same time as I used the blasto box I picked up the "I'll never work for Cerberus, level 1" box. That box told me that I had met the illusive man but only through some quantum something I didn't understand (flavor text) and went on to say that opening the box unlocked something in my mind and I would know exactly where he was the next time he showed his face (more flavor text, paraphrased). It gave me the 2-shot SK cop ability which I used on Numbers the night after the kill he claimed on Laarz and then withheld my second shot until I used it on Zokar and gave the results.
Now, the kill flavor last night. It reads as if Zokar tried to do something and failed. We had an earlier kill with a similar flavor, where someone failed a critical mission. I posit that these two kill flavors may be how the serial killer kills look. They look like "accidents" or situations where the player attempted to do something and failed. There have been at least two ... someone earlier claimed to have had a conversation with someone who died from a self-triggered ability and up until now I had been noting the deaths worded the way today's is as things the player did that backfired.
It's possible that Zokar was a neutral and killed himself last night, but I find it far more probable that what we see is what the SK kill looks like, and I posit that we've seen it before and just didn't realize it. If we feel that the kill is indeed the work of an SK, then that leaves just me or pyro.
The logic for clearly numbers is basically irrefutable to me:
1.) He told us day 1 that his box gave him the info that boxes could change one's alignment.
2.) He took credit for the Laarz kill so quickly after day start, with such a long post, that it's impossible to conclude he didn't know beforehand that the 2nd kill was coming and who it was. This essentially confirms his vig claim, and I investigated him after this and he came up clean for SK.
3.) We were all limited to opening 2 boxes, so he could not have later become the SK by opening a box.
Further, if my theory that we've seen the SK kill before and just didn't realize it is true, then the SK was already in operation so we cannot even make a supposition that someone targeted numbers and turned him into an SK after my investigation.
Since we are in LYLO and must lynch, and since I know I am town and have told the truth throughout the game, and since the kill last night does not appear to be scum flavored (which would point to numbers), and since I cannot find a fault in my evaluation of numbers, then I am left to conclude that Pyro is the serial killer.
Generally the rule on LYLO is not to rush the votes, but at this point the only scenario I can think of where numbers is scum is if there is both a scum and an SK left or Zokar did something that killed himself and Numbers is scum and just didn't kill again and the latter seems completely unlikely, given the way the game has played out.
Therefore, I put the game in Numbers hands.
Vote: Pyrotechnician
Numbers, if you're scum you fooled me the whole game and well played.