Wilhelm told a story about a piece of embroidered fabric, about 30 cm x 30 cm that came into his possession. On it, the Italian prison camp at Zonderwater is depicted in an unsophisticated way – it looks like naïve art. He was unsuccessful in locating the original owner and he contacted the Italian embassy.
The artwork was handed over to the Italians. As a result, he was invited to the celebration of the Italian national day during June and he was also invited to the annual function at the cemetery at Zonderwater. The gift was framed and is now on display in the cemetery's museum.