If DFEH wants a breakdown, then providing a single number won't be very useful. On the other hand, If you don't respond at all, DFEH won't have anything to use to help get you a settlement.
If you want the maximum possible award, you need facts to support them. The logs can give DFEH the necessary evidence it needs to get you the maximum award.
The less you provide, the less the investigator has to work with. So, think about trying to create the logs, because even if you have to work on it for the next two days and then have it couriered by hand to DFEH, it may be worth doing in the end.
I can't give you a "fallback" position, because in my opinion, there is no fallback. You need to come up with evidence or you won't get a reasonable award. It's just that simple.
Hope this helps.
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