It's not like they were making it up The number is actually on Roku's support page under "Chat with us," and it's labeled RECOMMENDED. The number does in fact work. I just called.
I realize this is old, but.
What you need to do is order the Recovery Disks for the laptop.
https://www.csd.toshiba.com/cgi-bin/tais/support/jsp/serviceUnitVerification.jsp