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Correct me if I am wrong, but if anyone is unsure of their Order Date, you can find it on the first page of your order agreement listed as "Order placed with electronically accepted terms". At least, that is what I have always referred to for my OD.
I'm in the same boat (OD: 18/03) but note that if you have ordered a RWD then the most recent OD to receive a VIN is 19-Feb and that is almost certainly a reallocation of a rare build. The most recent batch of factor VIN allocations for RWD were for cars ordered around 03-Feb. LR and P orders...