From the New York Times, 4/20/1865

THE KEY OF CASTLE THUNDER. – Rev. Dr. BROWN, editor of the American Baptist, has in his possession the key of the notorious rebel prison, Castle Thunder. It was brought to this city by Rev. SOLOMON GALE, of Tolland, Conn., and it is intended to dispose of it by auction for the benefit of the orphans of our volunteers. The key is by no means a formidable-looking instrument, being about the size of our ordinary door-keys. It has apparently seen much service.