Yes, that is right. It's a well-documented case. See this link connecting to Fold3 which is a genealogical site with military records that has some Hessian jewel trial information:
--Previous Message-- : The Hesse Cassel jewels were stolen by : American soldiers, in a pretty : well-documented case. The authorities knew : who stole them, and I believe the thieves : were tried in court, but the jewels (more : besides this one set) were never recovered. : : :