Probably dust particles and slight rotation while in the backpack.
this post was submitted on 26 Jul 2024
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This wear pattern is formed by spinning while some rough object touches the disk. Are you spinning them a lot in the cases with your fingers - absentmindedly? If not, it's for sure the player.
You caught me. They are clearly 2D orbs.
In the book "Off To See The Wizard" by Scott Meyer, the wizards are time travelling hackers. One of them has a glowing blue orb in his study that turns out to be the display of his Commodore 64 computer.
Nope, but they may spin while in the backpack. Additionally they may also get pressed slightly. The scratches also develop on the cases themselves.
I find it hard to believe that they'd spin so much while inside a case, no matter how it's rattled. That said, stranger things have happened.