Get your neighbors to pee on them.

Good grief, that just cries out to be recycled into more cardboard! Is there any way to do that where you are?

I have several truck loads myself, I use them to smother the grass in the orchard & they kill 90% of it in 4-6 weeks.
I have 3 perennial weeds that will take longer. You can cover the boxes with greens ,because they are browns or shred them with a lawn mower & mix with grass clippings. You have a worm bed, the earth worms love paper.

I use all the boxes that come into my house to make paths to my compost bins, behind the shed, whatever. I just pile them on top of each other (although I don't get 3 feet of boxes a week!). No matter how many I pile up, they're all about gone by next spring, and what's left goes into the compost bin.I agree with Joli - worms love paper.

RpR, I doubt I would have much success starting a community urination program, since we don't even recycle here. But it does make me wonder if there would be any other alternative amendment that may accelerate the decomposition process.

I've been piling some in raised beds and other places as a lasagna garden type of thing, but I do not have enough other materials to top them with. The unsightliness of just laying them on the ground proves not an option on my property.

I'd love to get some worms chompping on the stuff; but with this bulk, I doubt I would make much of a dent.

If I created a 10'X10' pen and just layered the boxes in that, how long would it take to decompose? Would that attract roaches?

I said I collect 3' of cardboard a week, but that is not every single week. Some weeks we get much less than that, but it is a lot and I hate to just keep burning it all.

Thank you for everyone's input.

How do you shred cardboard with a lawn mower?

Free coffee grounds, whatever you have for food waste, free cardboard and a 10x10 space sound delightful! The urine would give it some extra nitrogen as well. Even if only added occasionally and in non communal amounts :)

The company I work for recycles almost everything cardboard...except for what I take.

If it's straight up cardboard(no nails, staples, metal, etc.) I suggest buying a small wood chipper. Make sure the cardboard is nice and dry to avoid clogging, and chip away.

Also suggest using a bag at the end.

Use the ground up cardboard in a mulch pile, sprinkle it on your grass(water afterwards to avoid drift) and it's great for starting campfires.

Worms will still love it(by the way, I learned something from this, I didn't know that. Thanks guys and gals.)

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The chipper and coffee grounds is the path I'd take. I casually gather a hundred pounds a week in coffee grounds. Double if I work at it a bit. Worms dig it.

Another possibility would be seeing if you could get the produce waste from the local market. That can be a pain as some want you show up at regularly schedule times usually during the week and usually during regular working hours when I can't get there. They don't care for my dumpster diving.

to sense
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rott right, chipper & coffee waste is best.
Around my cardboard the weeds grow high, I cut them with the lawn mower & get a little box too.
It just shreds, as I pull back.

Another possible way to easily shred your cardboard is to soak it in a trash barrel, then tear while soggy. This works for both my compost pile and my worm bins. Also help starts the decomposition process.