Matt's Boxes 2019

I thought that one might be 28 Paul, but I've just measured it and it is 32 or pretty close to it. Strange then that they have never even looked inside, even as they inspect the eaves just a few inches above it. Perhaps the box is just too low for them (about 1.8m), or perhaps we just have fat sparrows around here?

edit: Actually I'd say its 30mm. Worth widening a bit?