/usr/include/seqan/find/ is in libseqan2-dev 2.3.2+dfsg2-4ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/seqan/find/find_abndm.h
/usr/include/seqan/find/find_ahocorasick.h
/usr/include/seqan/find/find_base.h
/usr/include/seqan/find/find_begin.h
/usr/include/seqan/find/find_bndm.h
/usr/include/seqan/find/find_bom.h
/usr/include/seqan/find/find_hamming_simple.h
/usr/include/seqan/find/find_horspool.h
/usr/include/seqan/find/find_lambda.h
/usr/include/seqan/find/find_multi.h
/usr/include/seqan/find/find_multiple_bfam.h
/usr/include/seqan/find/find_multiple_shiftand.h
/usr/include/seqan/find/find_myers_ukkonen.h
/usr/include/seqan/find/find_pattern_base.h
/usr/include/seqan/find/find_pex.h
/usr/include/seqan/find/find_score.h
/usr/include/seqan/find/find_set_horspool.h
/usr/include/seqan/find/find_shiftand.h
/usr/include/seqan/find/find_shiftor.h
/usr/include/seqan/find/find_simple.h
/usr/include/seqan/find/find_wild_shiftand.h
/usr/include/seqan/find/find_wumanber.h