rulefan
Tour Winner
Interesting, thanks, i didn't realise playing the provisional ball as you describe is one way to declare it lost. So your playing partners could be desperately trying to find your ball in dense rough, quickly play the provisional ball (nearer the hole than 1st ball) before the 1st ball is found.
There are no ways to declare it lost.
The ball is deemed lost under the rules by various actions or lack of action.
See the definition of Lost Ball.