Oh no! I found a beetle!

[Tenor CS]

I was playing humidor tetris today, when I opened the small 20-ct humi that holds my ************** (name of manufacturer deleted) sticks. I was dismayed to find a little bug crawling around. I thought to myself "Oh my god, is that a beetle?"

Turned out it was. It looks to be the only infected stick. I tapped it on a piece of white paper and saw the tell-tale droppings dust. I sliced it open and saw the round beetle holes. I also found a larva in the sliced open stick.

I also inspected all of my other humidors, and they look ok.

Now, I'm kind of freaking out, but I'm hoping it was just a one-off.

I have contacted the manufacturer, but I'm not looking for them to "make it right." I know that we are always at risk of beetles, and I'm just trying to figure out what I'm doing wrong, storage-wise.

I use 65% Heartfelt beads, and we keep the A/C in the house at about 72 degrees.