If you can’t see any telltale move marks, look for ‘shiners’ poking with the underside on the roof. A shiner is a nail that missed the framing member when the roofer nailed down the roof decking. Last but not least, don’t forget about to document just as much as possible. https://andrelnify.thechapblog.com/32899123/roofing-contractors-near-me-for-dummies