I use the rectangles with beads in them. I chucked that cheap green floral foam crap. It's funny because both of my recent cigars which had mold were sitting right above the humidifiers on the shelf above it.Not sure how you had these stored and what you used for humidification but when I started out I had this happen. Here was my set up...
300 count humidor with 1 tray and space for boxes underneath.
rectangle humidifiers (2) filled with distilled water only.
The humidifiers would not stay stuck to the lid so I placed them on a box under the tray.
RH was 68%
I got mold on two cigars sitting on the tray right above one of the rectangles.
Lessons learned:
Never use the foam rectangles without a 50/50 solution of distilled water and propylene glycol.
Switch to Heartfelt beads or Boveda packs. Chuck those piece of crap rectangles.
Leave adequate headspace between your humidfication device and the trays above. (Does not apply to Boveda packs, you can use those anywhere)
Hope this helps. If none of this applies to your situation, well then, move along...nothing to see here!:smokingme
RW
I got a 300 count humidor as well.