Glad to hear the hogs are back, despite the building works. I expect the hog was just having a general exploration and forage – exploring old haunts. In the process, it would be nice if it was checking out the hog box for a future residence, but I guess it’s a case of wait and see! The males tend to move nests fairly often and the females may not be quite ready to make a birthing nest just yet, but might bear it in mind for nearer the time. Fingers crossed. It would be lovely to have hoglets born in the garden.
Good luck and happy hog watching!