Nesting box for blue slate

[Griffith5]

We recently bought a blue slate pair. She has been laying eggs randomly in their fenced in yard. We would like to make a nesting area for her. Is it better to build a box inside their nighttime coop or outside? Should we just try a homemade nesting area in the wooded part of their yard? Any advice would be helpful. Thanks!

 

[ColbyNTX]

Some turkeys never use them and some do. I use medium doghouses with hay inside. They do like something covered so they feel secure.