Which One?

"How did you know that, Guust?" King Yianni asked.

Guust cleared his throat. "I went to the site of the accident many times and found a clue there. I do not know where that emblem came from but I know that it is not from our kingdom," Guust explained to the king as he continued to rack his brain on the next thing to say. He knew that he had to be ready to explain and he was aware that the king could ask thorough questions. Guust was scared and nervous but had to be careful not to allow it to show otherwise the whole thing would blow on his face and he did not want to incur the wrath of the king.