Used camper purchase, possible roof issue - please advise

I should also mention that the leak did not show up in the interior, as the water entered at the roof/cap corner and followed a stud down inside the wall. Water exited on outside at the floor between the siding and flooring. Leak was caused by a miter cut of the roofing material that exposed the OSB at the corner just under the molding strip. I bought the 3 YO trailer used, so no warranties. The strip popped up after several extended trips.