Hi mygrove
I’m not all that familiar with wine crates, although I have a feeling there are different types. But really any structure within which the hogs can build their hibernation nests could be helpful. Naturally they would have built them in i.e. hedge bases. So the most important thing is a structure within which they can build their hibernacula as well as sufficient materials.
They need hugely more materials than we might first think as they layer the leaves together to create a waterproof and well insulated nest – that is the ones who make their nests well! Also, if they can find sufficient materials, of course.
There is some more information about hog houses here:
https://www.hedgehogstreet.org/help-hedgehogs/hedgehog-homes/
