A direct response mystery...

[Ankesh]

Two sales offline is too small a number for prediction for further offline sales. Statistically insignificant.

Both the sales coming on the same day could just be a co-incidence.

If it would have been 20 sales by cheque on 1 day - and then no more - then it would have been worth it to investigate. But statistics don't really work in giving a good idea with such small numbers.

The only thing you may want to see is if the 2 offline mails came from the same area or came from places very near to the mailing address you used or not... (I am assuming that your target audience is specific and similar. If its a general audience - then you may also want to see if you can find any commonalities between the 2 buyers.) But I doubt if you'll find anything of significance.