I understand some are reluctant in leaving the Logs seeing how the market value seems to substantially lower with missing logs. Here is my take on the whole thing, the aircraft is worth 100% of the value and you left it there, your also putting your trust in them that you and your family and friends will be safe to fly in the aircraft when they are through with the maintenance. You have copies of the logs, which makes reconstructing them very easy especially since they are actual photos of the pages. Shops / A&P IA deal with logs all the time and I would imagine the percentage of “lost” logs is probably lower than those lost by the owners them self. For those that are worried about your logs being held ransom my advice would be to communicate better with your maintenance facility as to what the cost is going to be before the repairs take place and get it in writing. Working “with” your maintenance facility is a whole lot more pleasant than working against them. My suggestion would be to make paper copies that are very legible for next time, thumb drives are nice but are more than likely harder to deal with than you think. I have copies of all my logs, 337’s and STC’s, etc...(actual digital photos) and spent the time to print them out and get them in a binder and I still give my Original Logs to the IA when he asks for them.