About half of the 500 million free COVID-19 tests that President Joe Biden recently made available have not been claimed, according to the White House. Biden administration officials told The Associated Press that Americans have placed 68 million orders for packages of tests, which contain four COVID-19 tests each. That leaves about 68 percent of the stock still available to be claimed. “We totally intend to sustain this market,” Dr. Tom Inglesby, testing adviser to the White House COVID-19 response team, told AP about the unclaimed tests. “We know the market is volatile and will come up and down with surges in variants.” The shortfall in tests being claimed likely is due to a significant drop in COVID-19 cases across the United States, as well as an easing of restrictions such as vaccine mandates or masking in primarily Democrat-led states in recent weeks. “There is no question some people found out …