There was no soil around the edge of the hole. The grass was a bit thin near the hole so the hole might have been enlarged slightly.
I forgot to say that the second hole was slightly smaller. It was made in longer grass (just longer mowed grass) and the grass doesn't seem to be disturbed - it's still covering the hole which was why I didn't spot it first.
Does this help? Do you need any more info?
Cheers.