[MrBoxster]

I bought my boxster used and I saw a sticker where the oil change stickers are usually located. It was from Costco and apparently there is a 3-month service for the nitrogen-filled tires. Apparently the last guy bought the tires at Costco and they will always fill them and rotate them for free. The only problem is that I dont have the Costco receipt so I will not be able to get them serviced for free.

Anyone have an idea of how I can scheme free rotations and fills without the reciept or original costco card? I do have that originial service sticker still on there.