Soap From a Forgotten Land
Remember the episode in ‘Friends’ where Ross and Chandler take a whole lot of goodies from the hotel they’re staying at? Most of us aren’t as bad as them (we hope) but there’s nothing wrong with taking home a soap or shampoo. You never know when it could become a piece of history.
This OP found an unexpected souvenir when they were packing up to move in the form of soap from a country that no longer exists. The soap seems to be from Hotel Esplanade in Zagreb, Yugoslavia except Zagreb is now the capital of Croatia, and Yugoslavia no longer exists.