The puffin sightings are the latest in a long line of positive signs of the impact of conservation management on the island.
Annual surveys show a steady increase in eider ducks, guillemots, herring gulls and little gulls on and around the island year after year.
It is not certain whether the puffins seen this year managed to successfully raise a chick.
But Mr Crory remains positive.
“Our hope is that the Isle of Muck will become a thriving hotbed for puffins and, over time, recover other lost species such as the Manx shearwater.
“At the moment we are waiting with great anticipation to see whether the first 'pufflings' – baby puffins – will appear on the cliffs next summer.”
“That would really be the icing on the cake.”