Germ 101:
Temp + Humidity = success!
You need to make sure the room stays around 70 deg F and you need to re-wet the towelette as it gets dry. When I germ in a air tight media like a bag or tup it takes about 3 to 4 days sometimes a week.
I use the plate method and it works great. 9/10 germ rate. Take paper towel and fold it into a rectangle that is approx 4 inches by 2 inches. wet it with WARM water. place the paper towel on a plastic plate (plastic because it maintains temp better) place seeds in towel and fold over. press down on towel to ensure all sides of seeds are touching towel. place a second plate upside down over the first plate to cover. set plate on a shelf or in a cabinet where the temp will remain constant.
Then using a sprayer, lightly mist the towel as it needs re-wetting. 48 hours usually the case.
As for your current situation,
make sure your temp is right, and don't bother with the humidifier, you will need 100% humidity for it to be truly effective. just make sure your paper towels stay moist and if the lid is closed, open the Tupperware lid a few times a day for fresh air while maintaining a dark environment.
I have seed seeds germinate in spilled soda pop in the cup holder of my car where the temp had to be over 90. So don't fret. These little guys are pretty resilient and best of all they want to live. If what you are doing doesn't germ them in a day or so, change your method.