What should I do if I lose my arrival card in Thailand?

If you've lost your arrival card in Thailand, you have a few options depending on your situation. If you need to extend your visa or require immigration services that involve the card, it's advised to obtain a police report before heading to the immigration office for a replacement. If you only need the card for departure, you can often get a new one at the airport when you leave. Several users have shared their experiences, confirming that the immigration office may provide a new card, sometimes requiring a police report, while others successfully received a replacement at the airline check-in counter.