I asked them about it and they said they didn't even confirm if it was true or not because they're a friend and apparently you should believe everything someone says if they're your friend. ¯\_(ツ)_/¯

Edits from my above post:
EDIT: 20 minutes later, nothing so far. Not even a sighting of one dropping to the ground. Going to go for another 20 and if I don't get one then I guess it's proven you can still only get 1.
EDIT 2: 40 minutes have past and still nothing. You can still only collect one key so don't bother wasting your time.