/etc/sane.d/hp4200.conf is in libsane-common 1.0.25+git20150528-1ubuntu2.
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 | #
# Configuration file for the hp4200 backend
#
# HP4200
usb 0x03f0 0x0105
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