Hi Lynne W
Yes, it’s quite normal for hedgehogs to change nests. It’s probably unusual for one to stay in your hog box for so long. Normally they change nests fairly regularly, not least to avoid build up of parasites. However, I would be inclined to leave the contents in the box for a while, in case the hog has plans for it. But later on, once breeding season is over, but before hibernation – and you are certain no hog is using the box, then it might be a good idea to clean it out and use boiling water to get rid of any parasite eggs which may be there.
https://www.hedgehogstreet.org/cleaning-out-boxes/
Hogs do tend to disappear at certain times of the year possibly to visit other parts of their ranges. Hopefully the hog will return to visit even if not to nest in your garden, although it might do both.
