If for any reason you feel you didn't get the proper reward from a recent quest, first make sure to refresh your farm and double check your gift box, searching with proper spelling for the name of the reward. That's where it should go! Remember that sometimes you'll need to clear your browser's cache or cookies to ensure things show up properly: https://www.facebook.com/help/1416643995215690 that article will help guide you through clearing those!
If you've done this, and are still having no luck, then definitely send us the info about the quest this is happening to you on! However, please remember: with so many different Quests, it makes it very hard to help you without the name and number, so do be sure to give us the exact name and number so we can speed things along for you. Once we have that info, then we can see what the problem is and do our very best to help you :)