I think I know where you're going with this but there's no real proof one way or another of exactly which Thinkpad model(s) may have been involved. One machine that for sure fits the significance you're hinting at is one of the Thinkpad 760s as it's actually been documented to have been configured as such.

EDIT: I love my 560E. It's thin, light and feels a lot like a polycarbonate iBook.