It may have scanned the /sdcard directory and not an external SD card. Most people don't realize that your phone's internal memory is a built-in SD card, and that's what it's called in a lot of logs. For example, your Download folder is ./sdcard/Download. You'll also see it called /user/emulated/0/..., which is actually a fake (emulated) directory that's basically a copy of /sdcard/...