Any ideas what these spots are?

[DocBrock]

Have a tomato plant with some strange dark "stains". Can't find any pictures on any disease ID documents that looks the same. Plant was still green and not wilted at all. I pulled it just in case. I sprayed other plants with soap and neem mixture the evening before, but none of the tomatoes. All the plants are in close proximity in various containers, and it almost appears as though overspray splashed onto the recently planted tomato transplant. It hasn't rained in forever, so that's the only time the leaves would have gotten splashed. The day before I took the pictures below, the leaves were perfectly normal. The plant is gone, but I'm asking so that I may be able to reuse the potting mix that it was planted in it it's not a disease.

Thanks all!