I bet a dollar that, out of 100 TR3s, actually on the road, ALL of them have at least some bondo. There might be a garage-and-trailer queen, out there somewhere, that has none -- but any TR3 that gets driven has had it's corners chunked up. Those bumpers are WORTHLESS!!!!!!
Mine is in the body shop, as I write, getting sorted out from this summer's side-swipe. The body man is a metal master! But there will be some skim coats of bondo, you can be sure. And, yes -- there was already some bondo on it prior to this trip to the body shop -- though not "much."