I doubt that this would have caused cap or rotor damage. If it would damage anything, it would be the more sensitive solid state components such as trigger device and ignition module. These parts typically work or don't work, they typically would not degrade. This is my experience from non MB cars.
The pros on this forum, may have differing and, of course valid, experiences that apply to MB's.
'84 Euro 240D, 523K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in