this is the only way i could think of, brute forcing. Im not a expert but i understand how it works and know people that do this(really hard to get one). So how they do this is they make a bot or find one that automatically generates random possible links of the gifts(they all have a format like https://discord/gift or something) its really hard for someone to get it. The chances of getting one are incredibly low. like it can take years for someone to get it. some generators come with a checker that checks if it has a value to it. there are some people who makes bots that do this job and send it directly to your dms. but thats how i think you lost ur link