When I purchased my GT car, the log book was missing. I knew the cage number, the date of issue, including the tech inspector and the region. I was not able to even get a reply. Ended up as suggested resubmitting the car as "new". The problem you may run into with your IT car is that there was a time when ERW tubing legal for roll cages. I don't believe it is legal now. ERW tubing has a seam and should have been .120" wall thickness. I was suprised as you are finding out, that there is not a centralized database of log books.