Christmas Gifts Stolen without Recording

Three Christmas gift boxes were placed in front of my entry door at 10:45 AM on 12/16/19. The Ring video shows that the boxes were still there at 2:46 PM, but when my daughter came home at 2:48 PM, the boxes were not there. However, there was no Ring video that captured when the boxes were stolen between the two minutes. Do you have any idea why there was no recording in the two minutes? What shall I do?