During the summer of 1855 several British warships were deployed along the coast of Finland to disrupt coastal shipping Firefly was one of those stationed in the Aland Islands. Other ships on this station were – Porcupine – Harrier - Driver
For original documents, then the original ship’s logs are available at the National Archives in London.
For HMS Firefly:
http://discovery.nationalarchives.gov.uk/details/r/C1468610 For HMS Porcupine:
http://discovery.nationalarchives.gov.uk/details/r/C1472741 For HMS Harrier:
http://discovery.nationalarchives.gov.uk/details/r/C1469430 For HMS Driver:
http://discovery.nationalarchives.gov.uk/details/r/C1467884Original documents, including letters from officers, were published by the Navy Record Society some years ago. The publication that would be of interest to you is:
Russian War 1855 Baltic
see:
https://www.abebooks.co.uk/servlet/BookDetailsPL?bi=22696552203&searchurl=bi%3D0%26ds%3D30%26bx%3Doff%26sortby%3D17%26tn%3Drussian%2Bwar%2B%2B1855%2Bbaltic%26kn%3Dnavy%2Brecord%2Bsociety%26recentlyadded%3Dall&cm_sp=snippet-_-srp1-_-title6This last book has several letters from Captain Henry Charles Otter, commanding officer of HMS Firefly for the period which gives the movements and actions of that ship for the period
It includes a letter from Captain Otter, dated 7 July 1855. He states that during the evening of 4 July, being “to the west of Korpostrom” he launched his boats “...to examine the islands and fjords for merchant vessels”. The boats landed at Fagerholm and examined the buildings. The intention was to destroy them but finding “…there were six women and several small children in the dwelling houses, I considered it an act of humanity to allow them to remain. The whole were examined, but nothing belonging to the Government found in them”.
The boats returned to the Firefly during the morning of 5 July, and the ship sailed that afternoon for Abo (Aland)
There is no mention of taking anyone
The standard book about the Royal Navy in the Baltic during the Russian War 1854 -55 in English is
The British Assault on Finland by Basil Greenhill and Ann Giffard - see:
https://www.abebooks.co.uk/book-search/title/the-british-assault-on-finland-1854-1855-a-forgotten-naval-war/author/greenhill-basil-giffard-ann/ They mention that the British did capture local people to act as Pilots, citing one case of Jacob Westerlund who was captured at Lumparland, but later put ashore
They also cite the book
I Kulturens och Krimkrigets tecken by Al Ahlstrom as a useful source. They quote from this book on the activities of the Firefly at this time, including that they had gone to the family house at Stockholmen and broken in, taking "...a carafe of cognac and glasses".