I take work from best connection down here in South West never had a problem like that in the last 12 years as you say there isnt always someone there to sign them. Must be the office your dealing with.
You will see some “remnants” (i.e. registration numbers of trucks from ages ago) if there were card or tacho faults recorded while your card was in the head. I think it shows the five most recent such events (mine still shows some tacho power errors from a couple of years ago).