I’m an Australian who has a multiple entry working holiday visa for France for the year. I have travelled a fair bit to other Schengen countries and have noticed that on coming back into France my passport was not stamped. Because I also went to the UK, I have a stamp showing I left France. I have kept the boarding passes of all my flights. Should I try and find a way to get my passport stamped now in order to show I am back in the country, or are my boarding passes enough proof of where I have been?