General mold question. Stereoscope cards

So a couple days ago I purchased some Stereoscope cards for myself. They had a big box full of them. I bought 25. However, in the box was one or two moldy ones. No smell or stench just visible signs that there was mold spotting on them. Now my question is are they all technically contaminated with spores? I took the ones I bought outside brushed them all off and took an air pump and blew them off as well hoping to get rid of any spores. What would you all have done? Am I good to go?

The cards I bought look to be clean and no signs of mold whatsoever. Except for maybe one that had a slight mold like mark.

 

if they are very tiny i would take a toothpick with some bleach on it and just touch any dark spots......just a touch....