In the email they mentioned that they were doing for all interviewed applicants, and I don't think there are any good reasons for them to lie. Even if they do for ppl who they plan to admit, that does not mean that you are not accepted because probably they don't have any issues finding your official GMAT score report.
@LexLuther: huhmm that's exactly what I thought at first but I would imagine that an adcom will make sure all the GMAT scores are exactly as reported. Yesterday, I talked to the admission office and they directed me to IT support. As you could imagine, matching scores is not that much of a hassle via IT.