The reason behind the saying .... Don't look a gift horse in the mouth.
When you look inside the mouth of a horse, you can tell a lot about its health n age. So if your given a horse, you're just to accept it. Despite it could be fit for knackers yard and turned into glue, or cheap beefburgers!
However, I do look into a gift horse's mouth. Don't dump your crap on me! Dont polish a turd and tell me it's a precious stone. ....... This is not relevant to anything Anker has given away. All their stuff n giveaways are fantastic and a privilege to receive... No mouth checking needed!