We deployed low-effort vole trap boxes a few weeks ago, only to discover no voles checked in, most likely due to wintertime gardens consisting of bare earth. I had weighted the boxes with convenient rocks that pretty much crushed them flat during rainstorms.
So I converted a few dozen square feet of cardboard into better-looking boxes and transferred the traps:

That one has a rat trap inside.
Smaller boxes hold mouse traps:

Two pairs of 4 mm holes on the bottom flanges fit some spare irrigation pipe holddowns to, yes, hold them down, with those rotten planks keeping their lids in place.
They’re lightly customized “Electronics Boxes” held together by hot-melt glue. The jawbreaker URLs will get you started:
Cardboard remains the wrong material, but my stockpile remains well-stocked.
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[…] larger vole trap boxes didn’t survive the early spring rainfall, so we decided to upgrade the fleet with more […]