If you're receiving stuff in the mail (like the lunchbox with ashes) or stuff literally just dropped on your doorstep (the dead flowers), it's extremely unlikely that someone on the internet you have absolutely zero connection with just randomly picked you to ruin your life that badly just for some lulz.
I'm glad the OP was able to take the steps he needed to identify his harasser, which I'm sure was a lot more empowering than living in fear and checking his door locks every night.