https://go.dev/doc/security/fuzz/#glossary says that there are 2 body types:

generated corpus:

Located in $GOCACHE/fuzz/<ProjectModuleName>/<PathToFileInProject>/<FuzzTestName>, $GOCACHE can be found via terminal: go env GOCACHE and lists all test cases that are marked as new interesting.

seed corpus: These are your own seeds generated in your function and the failed tests in ./testdata/fuzz/<FuzzTestName>/