To whom it may concern:

My firm and I have thoroughly reviewed the data backup from our legacy system and all of the relevant data exports as we would expect. We are happy with the results and would like you to begin the final migration into the production environment.

We understand that, after the migration is complete, if we discover something is amiss, it will be our responsibility to resolve it because it was insignificant enough that we did not discover it in our own thorough testing prior to the migration.