Hello everyone! The person who found the camera is a friend of mine, she lives in Quebec City and she is bilingual, so you can communicate with her in English. There is a post on the Cayo Largo forum: http://cayolargo.forumscuba.com/viewtopic.php?f=1&t=10984
The family indeed stayed at the Pelicano, and they might be from Eastern Europe, as there is a picture in their camera from Election Day in Slovakia from March 2014.
As of last night, they had not yet been found, but the post was shared almost 35,000 times on Facebook! Global community indeed!