Well, you could put the old options back to the config file, do the export, then remove them again.
But have a look at the Elog database files ZZMMDDa.log in your logbook directory, they are pure ASCII files, which are relatively simple to parse.
Hi John. The problem with using the Find-->Export method is that some of the Attributes for the older data are no longer shown on that screen because the Config file has since changed. That's why I'm contemplating somehow parsing the log files directly instead.