app-shells/sandboxshell-0.3-r2 installs the config file with name sandboxshell-r1.conf which should have the name sandboxshell.conf as sandboxshell tool has the line: exec /bin/bash --init-file /etc/sandboxshell.conf. -doins "${FILESDIR}"/sandboxshell-r1.conf +newins "${FILESDIR}"/sandboxshell-r1.conf sandboxshell.conf in the ebuild fixes the issue.
fixed with 0.3-r3
Sorry about that.