nah it's fine, the converter is secured. it's not going to be spewing its' juices everywhere.
3.57 oz 90% silver
"Product Details: Approximately 3.57 oz of 90% Silver. Coins are packaged in a tightly sealed roll. All coins are dated 1916-1945."
Math.
$157
157/3.57=
$43.97/oz
for 90% silver