Inadvertent whistle -Ball placement on punts

[kfo9494]

Got a question and cannot find my book- believe I left them in a crew members car.
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1-K punts the ball from their own 20. The ball hits the ground where it is touch first by K at R's 40 yard line. The ball continue rolling to the 35 when R jumps on the ball but just muffs it- and ball is still rolling. The Back Judge then blows his whistle while the ball is loose.
What can now happen with the placement of the ball.

2-Same situation -but during the kick K or R fouls before the inadvertent whistle.

Federation Rule please.