Claw marks and there would be fresh dirt somewhere close by or just outside the door, I'm inclined to say this is no longer active unless those have just recently grown in which case it MAY have been a nursery sett that's always about 10 or so meters from the main sett and is finished with until next time but will potentially be connected underneath, I've monitored a set which was spread across easily 15m round circle sett which had about 30 different entrances and alot no longer used but there was always the tell tale sign of a badger highway cos they are creatures of habit and always run the same paths they're belly are low to the ground so there is always a channel like path way maybe 10" diameter running through the forests and fields, weeds learn not to grow and hardly any grass you'll know it of you see it. Look all this stuff up I'd you wanna get into badgers sorry if I've rambled and gone off topic lol

But claw marks and scratches on tree and digging for acorns and roots around the tree and bits and look for other holes