After reviewing under a microscope, I think I'm in agreement with MarcL. Initially, I had tried to squeeze one and it didn't squish, it being so small that's no surprise now, and that bit of info lead me to further think it was probably a seed. I grabbed a pair of calipers to measure some and they ranged in size from 0.020 to 0.045 inches. It squished easily under the calipers. After it squished I found a scope and dug through a can and found a dozen or so. Definitely looks like something that packed together in the manufacturing process, or maybe they didn't fully dissolve after being added. As they dried they got lighter in appearance and once squished they crumboed into a powdery mess. Here's some images showing close ups.