Motion alert is slow

I got person detected alert, so I opened the app who was there, and I saw one men holding a box but ring didnt recorded from when he walked toward my house, I only can see it recorded when he was leaving from the door and holding a box, so I couldnt see his face, and neither not sure if he took my pacakage or not. Because I ordered so many things to deliver so I am not sure if he is a theif or just found the wrong house since the Ring didnt recorded the who scenes!!