They only do this at the end of each quarter to get the car registered before the end of any quarter segment.
I ordered mine on March 30. And they offered to look around for a car that matched my spec if i were able to pick it up myself on the next day. As it was easter and i had my kids, i had to decline.
I called again the next tuesday ( April 6th) to tell them to look around too see if they had something i could pick up that week. I then got the message that this was only something they did at the end of each quarter, wich is why they mentioned i had to pick it up «the next day». Since we are now in April, that meens the start of a new quarter and we just have to wait.