As an ‘Opening up Archives’ trainee I was set the task of preparing a community engagement project. Being a Polish national with a Master’s degree in History, I decided to research the post-war Polish community in Leicestershire. As it turned out, the Record Office for Leicestershire, Leicester and Rutland did not hold many records regarding this community, however, all of my colleagues mentioned that there were something called ‘aliens’ cards’ in our strongroom. So I started my project by going through this collection, which had been donated by the local police force in the year 2000, and which consisted of 93 boxes. This deposit has not only become my main source of information for the project’s statistics, but it also provides essential knowledge about Poles living in the county.