You could also mention that the original data is on a SSD drive that is soldered to the motherboard of your MacBook Air/High-End Notebook/Chromebook and point out that even if you did send them a hard drive with a copy of everything downloaded that it would be just a copy. The original is uploaded 'onto the cloud' and not easy to delete even if you did smash the MBP to pieces, GCHQ/Guardian style.

Therefore, there is no need to send a drive, even a small child could understand that. A lawyer-type asking for 'the drive' does not get around this detail of how 's and 0's can be easily copied. Point out there is no need for the show.

Finally, go nucular on them. Say you are going to post your scraper tool onto github with full instructions on how to scrape their site unless $3,141,592.65 is donated by them to the EFF by teatime on Tuesday.