/usr/share/eccodes/definitions/grib1/local.96.def is in libeccodes-data 2.6.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | codetable[1] localDefinitionNumber 'grib1/localDefinitionNumber.[centre:l].table' = 1 : dump;
template localDefinition "grib1/local.[centre:l].[localDefinitionNumber:l].def";
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