Matt’s baseball
https://mattsbaseball.com/store/product/262/SHORT-COMIC-BOX-20CT-BUNDLE/
They aren’t the best but do the job. And for the price…
We need to make 2hr fire proof ones.
What’s that? I know what fireproof is but 2 hr fireproof? I’d of settled for waterproof myself.
One thing I don’t like is all the ridges on the outside. They collect a lot of dust and it’s tedious to clean. Only real complaint so far.
Get yourself a turtle fireproof file cabinet. They last 2hr and 2000°
Thought I had a deal there … but the shipping to my ZIP was $29.00 …
Sounds like you need to now invest in a new ventilation system to make your storage area a certified “clean room”… 
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How long it can sustain within the fire. 2 hours at certain degrees before it starts to fail on you.
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Still that’s $3.10 per box. Don’t know what you pay for yours but if you cost it out including your freight.
Use compressed air to clean the dust from all the ridges, nooks and crannies. Fast. Simple. Effective. 
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I have a supply distributor 60 miles down the road … boxes / bags / boards / gaming dice, etc … simply order $200 of any assortment and get free shipping … comic supplies are all BCW, so not bad quality … a short box runs about $1.75 each … it’s easy to make a $200 total order …