If there is an image but the post date is not as recent as the majority of your containers, it could be due to:
Low or no cellular signal in the location of the container. This is most common in very remote/rural areas or inside buildings/underground. This may get resolved the next time the container is moved
Physical Damage or an internal malfunction can also impact camera postings. If the device is in a location it normally posts, a visual inspection should be performed to see if the device is damaged or missing.
Contact us if you believe a replacement is required.