This file is indexed.

/etc/boxshade/box_pep.grp is in boxshade 3.3.1-8.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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This file is a Amino-acid grouping file for use with NEWBOX.
Each line contains a set of amino acids which are considered 
'similar' when calculating the consensus. The .SIM file is different 
and is used in colouring residues that are "similar" to a single 
consensus residue.
Other format requirements are the same as for SIMPLIFY.TXT in the 
GCG-package.
..
FYW
ILVM
RK
DE
GA
TS
NQ