If they were out in the open it was simply just dust collecting on them.

How did you store them? Did they have any risk of getting more dust inside?

Mine was stuck in France and eventually it was delivered to DPD Poland. 99% chance it will be delivered tomorrow

And I believe they also ship them from Poland to other countries ;)

Ordered from Nintendo IE and it shipped yesterday (from France). Despite Nintendo putting Poland in a 2nd world country list it actually has a chance to get delivered tomorrow;)

The eMMC is not paired to CPU, I have replaced mine with a 64 GB one. Had to dump data from the original, restore it to the new one and use some tools (including patched hekate) to repartition it. I’m keeping the original module as a backup