Is this scale in the pot?

[SundayGardener]

Hello,

I am fairly positive that I found scale on a few orchids, which I spot treated with rubbing alcohol (removing the scale). However, I have seen what looks like scale to me inside plastic pots. In the past, because the spots don't move, I decided they were bits and pieces of spaghnum moss. I've only seen these spots in pots that have pieces of spaghnum moss in the media. Now of course I am more suspicious and thinking that I need to repot.

I have seen spots like this shortly after repotting as well, which is another reason I didn't take them seriously.

Hopefully the pictures are clear enough for a verdict. They are basically well defined white spots with smooth edges, that to me look somewhat like a white seed hull or a dead insect or cast off shell of an insect.