Follow-up:

Here is a follow-up post to my mysterious seeds from last week. I decided to grow them inside a cotton pad inside a ziplock bag and they successfully germinated. I now have these sprouts. I could say maybe it took me like 4 days for them to sprout. Here is an image of their leaves. Upon a closer look of the sprouts and the fact the seeds are tiny and shiny, I feel they're purslane. I placed them inside this pot.
Now, I know some might call it invasive, we call it that too. But we have a popular salad here that uses their leaves, so why not?