I know there's a penalty for taking shells from the Maldives. The laws are strict, but there are options. The easiest way is to buy a certified souvenir at a store and keep the receipt. A more complex option is to obtain a special permit, which takes time. For example, detailed information on prohibitions and legal options can be found here
https://relaxresidencemaldives.com/mozhno-li-vyvozit-rakushki-s-maldiv/