How can I verify that my scores have been cancelled?

<p>After taking subject tests today, I decided to cancel my scores since I'm likely not to be satisfied with them and don't want them to appear on my record. </p>

<p>I printed out the request form, after I fax/mail it, how will I know they have received my cancellation request?</p>

<p>Also, the proctor listed a different city for the test center than the one that collegeboard has for the center. Should I list the one that my proctor told us or the one the collegeboard has on my cancellation form?</p>