Last summer, discovered a hole in our roof. Slipped a piece of shingle under hole, and waited for fall to fix it. Apparently a limb went thru both layers of shingles, and caused OSB to rot. Fortunately, the hole was over soffit, and directly above vent strip, so damage was limiter to OSB, and shingles. This hole was on front side of house. This meant that replacement shingle, if new would stick out like a sore thumb. So this morning, went up on back side of house, which isn't visible from ground, and swapped out a couple of shingles with new ones. Took old shingles from the back and repaired the front. You can't tell I replaced a couple shingles because I stole them from the back side