YES?! I have a couple cigar jar humidors made of acrylic with the spanish cedar veneer bottom and I took a close look at the one that I disturb less frequently (I haven't moved the cigars for months but I do pop the lid every couple weeks at least) to discover mold beginning to form at the bottom of the jar. The mold was on the acrylic near the bottom, on the spanish cedar veneer, and on the outside of the cellophane. I wiped the cellophane without removing the cigars and the mold came right off. I guess with these jars popping the lid now and then is not enough, you need to let the fresh air get to the bottom of the jar as well.
Another case and point as to why I am a cello ON person, no harm done to any of the cigars.
Just thought I'd share as I never would have guessed mold would grow anywhere but on the cigar when there's no real food for the mold, but I guess the wood veneer became the food?