onb et al, a correction.
On second thoughts, I can’t remember the full details as the incident was decades ago, but probably the miscreant falsified the company forms only, making legal action unlikely to be appropriate. The advantage gained would be the same, however.
In the RAF my logbooks were checked and signed monthly, and inspected by the CAA for initial licence issue. Thereafter in civil aviation, they never received more than a cursory glance by any company, so the opportunities for fraud are abundant.