Sales between the 30 days period before dvat registeratio

i registered a cleint under dvat in voluntary registeration. the firm is registered w.e.f. 25.03.13.

and the first sale before registeration is made on 23.02.13.

so i want to know the sales between these 30 days (23.02.13 to 25.03.13) should also be shown in dvat return or only the sales after 25.03.13 should be shown in the return?

all the sales are interstate.