Sadly Chocks, you have hit it on the head, just a very few of your number are not to be trusted.
I was once called into the office to explain why I had let myself run out of landing currency, (one every 28 days, B747-400 operation). I protested my innocence, got out my log book and showed I had at least two landings within the required time. Turned out the FO had waited until I had signed off on the Voyage Report and then altered the PF, PNF columns to enhance his experience.
In your case I imagine, if necessary at all, the company stamp and a CP signature confirming the accuracy of your log book will be all that is required.