It is probably nothing to worry about. The ingredients in certain makeup products, especially those with natural oils and waxes can have changes like this. Even if you think your home/storage area is climate controlled, all it takes is minute changes in temperature and/or humidity to cause the oils and waxes to 'sweat' out and then crystallize. The crystals would look 'fuzzy' because of how small they are and how flexible the waxes are. If you could get a closer up picture, I could help better. Similar to Tom Ford, this is the results of using certain ingredients.
If there was a bacterial infection, there would also be a noxious odor. Molds tend to be very filamentous (stringy, feathery) and also the most common molds tend to be black or green. Also, mold would not discriminate between used surfaces and non-used surfaces, IMO, where as the used surfaces would be less porous and less able to have the waxes/oils leach out.
If you're uncomfortable with it, I would still contact CL and ask them about it. You can also wipe them down and then spray with ethanol. Personally, based on those photos, I would still use them.
ETA: If you ever notice a foul odor, discard/return. That is usually very indicative of some kind of infection.
Source: I do science to and about viruses and other nasties for a living.