After scrubbing data using the automatic Server-Side Sata Scrubbing, or masking in Advanced Data Scrubbing, is there any way to view the original unscrubbed data in the event JSON or elsewhere?

It is not possible to view the pre-processed event through Sentry. This is because all processing happens before the event is saved, and therefore, the original event with the unscrubbed data is never logged/saved anywhere.

The only way for you to access this would be to save your own browser's/server's network logs, as the envelopes that are sent to Sentry will still contain the unscrubbed data, as long as you're not doing any scrubbing on the SDK side.