Dell :: Why/How Did My Order Ship So Quickly?

I ordered the system in my sig early morning on 3/24. At the time of the order, it was estimated to ship on 4/2 with an estimated delivery date of 4/9. When I called to check the status the next day (3/25), it stated that the order was processing. When I checked again later that night, it said it was shipped on 4/6. I checked the status again the next morning (3/26), and this time it said it was shipped on 3/28 with an updated estimated delivery date of 3/31. Now today, on the 28th, I got the 'order has shipped' email along with the FedEx tracking number. FedEx's estimated delivery date is 3/30.

Anyone have any idea why or how my order could have shipped so quickly? I never did catch it in the kitting/build/testing/boxing stages...and these stages usually take at least a few days. Could I be receiving a recently returned system that just happened to have the same specs? It seems almost unheard of to receive a new system in less than a week after ordering it...especially when considering that they are built overseas and that I picked standard 7-day shipping. Is there any way I can tell if it is a returned system?

My friends and family somewhat jokingly said maybe it's because of my previous order history. I ordered the SXPS 1645 in late November, but later ended up cancelling the order in December due to the throttling issues it was having at the time. When I cancelled the order, it was already in the build stage for a day or two. Could Dell maybe have noticed my history and "rushed" my order this time?