Yep, those are seeds.
Why you got them? The leading theory from a few years ago was sellers getting fake positive reviews on their products by creating alternate accounts, "buying" the product and to fulfill the shipping status just sending some random leaked address a bag of the lightest, most cheap product they could send, just so platforms like AliExpress had an actual transaction completed allowing the review to be posted.
Do not plant foreign seeds or discard them incorrectly. You have no idea what that species is, and you do not want to be the one introducing a new invasive species to your local biome.