How to open (unpack) a Opensea lootbox

Question

In Opensea it is possible to offer a lootbox. A lootbox contains for example the option to mint three random NFTs of a specific NFT collection. The unpacking of a lootbox is coded in the Lootbox NFT Contract. For example in the Opensea sample contracts https://github.com/ProjectOpenSea/opensea-creatures/blob/master/contracts/CreatureLootBox.sol

In this example the unpack would mint three NFTs.

The point is: Where can I start the unpack-Function. Does Opensea offer a possibility to do this? Nearly anything else I can do on Opensea without the need to code a dApp. But I cannot find out how unpack the lootboxes without coding and providing a dApp to do this. I found a lot of documentation how to create and purchase lootboxes. But nothing about the unpacking. Somebody already found it out?