Sound is not a reliable way to determine if a nickel is silver. Silver War Nickels (1942-1945) have a large mintmarks located on the reverse side above Monticello.
Sound tests are not reliable or a good way to determine anything. That 1943 is 35% silver. The others are Cupronickel. https://coinweek.com/silver-war-nickels-history-values-and-varieties/
No one accepts sound tests as being accurate. Just glancing at your photo I saw 2 that are silver. For nickels, just look for a large P, D or S above the dome on Monticello.