were purchased by Lee S. Minshull of Palos Verdes, California, who then sent them to PCGS for grading in 2002. These coins were then sold to collectors. Coins salvaged from 4 WTC's vault included American Silver Eagles, Canadian Gold Maple Leafs, South African Krugerrands and British Gold Britannias. Hazards Hazards at the World Trade Center site included a diesel fuel tank buried seven stories below. Approximately 2,000 automobiles that had been in the parking garage also presented a risk, with each containing, on average, at least of gasoline. Once recovery workers reached down to the parking garage level, they found some cars that had exploded and burned. The United States Customs Service, which was housed in 6 World Trade Center, had 1.2 million rounds of ammunition and weapons in storage in a third-floor vault, to support their firing range. Morale In the hours immediately after the attacks on the World Trade Center, three firefighters raised an American flag over the rubble. The flag was taken from a yacht, and the moment, which was captured on a well-known photograph, evoked comparisons to the iconic Iwo Jima photograph. Morale of rescue workers was boosted on September 14, 2001, when President George W. Bush paid a visit to Ground Zero. Standing with retired firefighter Bob Beckwith, Bush addressed the firefighters and rescue workers with a bullhorn and thanked them. Bush later remarked, "I'm shocked at the size of the devastation, It's hard to describe what it's like to see the gnarled steel and broken glass and twisted buildings silhouetted against the smoke. I said that this was the first act of war on America in the 21st century, and I was right, particularly having seen the scene." After some workers shouted that they could not hear the President, Bush famously responded by saying "I can hear you! The rest of the world hears you. And the people who knocked these buildings down will hear all of us soon!" At some point, rescue workers realized that they were not going to find any more survivors. After a couple of weeks, the conditions at Ground Zero remained harsh, with lingering odors of decaying human remains and smoke. Morale among workers was boosted by letters they received from children around the United States and the world, as well as support from thousands of neighbors in TriBeCa and other Lower Manhattan neighborhoods. This support continued to spread