or simply make the boxes out of slabs of bark covered wood split from logs.
how about staining them brown with tannin from Oak/Sweet Chestnut bark soaked in water, or even teabags.
Use a coarse wire brush along the box wood grain to roughen it to increase absorbtion.
Probably need to chop the bark & boil it, make as concentrated as possible.
If its in contact with iron (eg made in an iron pot, or cooked with old nails) it will go a dark black/ blue, you may or may not want this, its a traditional recipe for ink.
I shouldnt worry about the paint on your boundary trees fading. I've had my wood 15 years and can still see the paint.
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