The original fluid-work.mbox was 296M and exceeded the maximum 50M size limit for files that can be committed to GitHub repositories. The mbox had to be split and compressed using the following commands:
sha256sum fluid-work.mbox > fluid-work.mbox.sha256
tar cjf - fluid-work.mbox | split -b 35M - fluid-work.mbox.tar.bz2.part
Reassemble the mbox and verify its checksum using:
cat fluid-work.mbox.tar.bz2.part* | tar xjf -
sha256sum -c fluid-work.mbox.sha256