I will be on vacation until July 20th (tentative). If you have questions, please contact me after the 20th since I will have limit access to email and will not be able to respond while I'm away. Have a nice summer!

Can you mark gift or lower amount for the customs form?

No, doing so is illegal here, therefore it cannot be done. Declaring the actual value will also proof the content of the package for various reasons. Especially when insurance might be applied. Please read the customer service page for more info on possible customs/duty charges from your country's customs office.