I have all three and nothing is happening

"Inside of the secret room, there are 2 treasure chests and an ancient carving."

I see 3 treasure chests in the picture (third one in the lower left, half buried)

I also experience bug. I can't open it even though I submitted the 3 required items.

For clarity the door is located at an entrace/exit ABOVE the waypoint

https://www.youtube.com/watch?v=jlZzSz9gM8E&ab_channel=GameGuidesChannel
that is what the ancient carvings are for

Me too plz need help

Some players like me had a bug where the door doesn't open, the boxes are removed from the inventory and it's impossible to interact with the switch again.