Why are taxi drivers always finding money and gold?

Taxi driver returns Bt3 million found on city street to truck crew – The nation, December 31, 2012
…Pongsin said his taxi struck the bag, which had been left on a road leading to the Rama III Bridge, at about 2am. Since it was heavy and he was afraid that it would cause an accident, he decided to take it home. Later in the morning, he found that the bag contained money and alerted Jor Sor 100 to find its owner…