NO, you don't need to pick the padstack. When you recorded the script, you recorded the entire process to place two pins with the required padstack from the Padstack list, in the required location(s). You did do that? Maybe not...
Of course, the drawing parameters will need to be set to allow the pin parameters you need..
Maybe placing 500 pins manually would be a better way?
FORM mini pad_browse
pick 0 0
pick 200 100
pick 400 200
prepopup 1126.3 1100.4