Hello Helbi --
Since you have the receipt (!), the CVP-905 is not exactly an inexpensive keyboard.
It has the Yamaha GrandTouch action which Yamaha is heavily promoting.
I played a linear-graded GrandTouch (CLP-785) and did not find the mechanical key noise to be offensive. Given the selling price, the store selling you the CVP-905 should make it right, or at least listen to the issue. If the piano is under warranty, then it would be worth calling regional Yamaha support.
I'm playing a CSP-170 which cost far less and wouldn't hesitate to call the seller or Yamaha concerning a key issue.
Hang in there -- pj