How can I tell if IMS has been replaced?

[dxterity]

I'm interested to hear if anyone else has heard of this but when I bought my '99, I immediately took it to a certified Porsche mechanic to have the IMS done. The first thing the mechanic did (before it wss even in the engine bay) was check along the inside of drivers side door for a sticker which Porsche mechanics apparently apply that indicates the if/when the IMS had previously been replaced and date the work was done. He told me this because he said they are supposed to be replaced every 6 years and it's a time thing not mileage. I dunno, maybe start be checking for this sticker/stamp, you might luck out.