/etc/schroot/sbuild/nssdatabases is in schroot 1.6.10-4build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | # System databases to copy into the chroot from the host system.
#
# <database name>
passwd
shadow
group
gshadow
|