It might be present in your web server logs, with the caveat that you may not have them or have access to them and the bots may not pass the HTTP_REFERER header and the logs may not record it.

It might be present in client-side logs, with the caveat the crawler might block tracker URLs or not open a page in a way that executes their scripts.

Either of these may reveal what the first-page was a crawler reached, or the pages they directly-access without navigating your site.

You might be able to correlate timing for when a "user query" occurs and subsequent scraping.