Blitz player cannot be found with the 'Find Player' option

This question has probably been answered but I wondering why when I've finished playing someone in the blitz room that I often cannot find their profile using the 'Find Player' button above? And yes I have made sure that their site names are spelled correctly and it also does not seem to be a question of provisional ratings as I often find a player that has only completed like 1 game. Just wondering and thanks.
TSaffle

Yeah okay. I found another thread about his and it is because the player has still not moved in any game.