Audi A6 rolls into the rear, no optical defects to see. Workshop or not?

On Friday afternoon, an Audi A 6 rolled slightly into the rear of our Clio III. Situation was the following: I am standing in front of a closed railway barrier, engine is parked, first gear is inserted. Suddenly there is a neat jerk and a not exactly pleasant noise. First joint inspection after this light rempler with the driver (Audi A6), which has rolled with his car into the Clio-Heck, showed no visible damage. Neither paint damage, nor bumps. ild has a minimal, actually only palpable bump. Question is whether such low speeds (according to the Audi driver’s statement that the brake has slipped) could have caused damage that is visually not visible from the outside?! Would you have the Clio tested in a workshop or would that be too much effort? Many years ago (beginning of the 1990s) I slipped to a bollard in a traffic-stricken zone at Glat ice times at step speed. On the outside, except for a dented no. sign, nothing can be seen, but the lateral beam in the front had got a good deal. OK, the car was an Opel Astra, built in 1992… so, according to today’s standards, no longer as impact-resistant as perhaps a newer vehicle. One often hears that remplers are completely absorbed by the impact surfaces at speeds of up to 30 km/h. What would you do?