Moisture spots on new PSA slab?

Hi everyone,

So I just received back a submission from Ludkins yesterday, and I’m thrilled with the results, but this morning while more closely looking over my cards I noticed some strange spots on the surface of most of the slabs. When I unboxed them, I sleeved all of them into some Cardboard Gold Perfect Fit sleeves, which I usually do, so at first I thought the spots may have been on the sleeve. However, after taking them out of the sleeve, I can still see them on the slab itself (below the bottom left corner of pokeball):

My thought is that maybe I trapped some moisture in between the sleeve and the card, like condensation or something, but I’m not sure.

I wish I’d paid more attention, as I didn’t notice if these were on the slabs when I first got them, but I wanted to check here and ask if anyone else has dealt with something like this. I don’t know if I should take them out of the sleeves now, or if the sleeves are even part of this at all. Thanks in advance for any and all input.

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An update: gently wiping the slab down with a paper towel removes the spots, so it must be moisture. Probably trapped cold air in there last night that warmed up and condensed this morning.

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In my experience it’s pretty common.

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