You can always reprogram it to the new codes, instructions are in the owners manual.. Now you have an extra spare.
Sucks but you did the right thing by getting new keys, since it was so close to your house if someone else had found they could have just taken your PT.. No muss no fuss.
__________________
The silver 03 GT is gone, but a Solstice has arrived. There are three more PT's to play with though
My personal thanks to veteran and novice crewbies that have offered information and how-to's they have been instrumental in taking LiquidPT from modded car to stock to live a more quiet and sedate life.