Never
However I was recently surprised to read , in a book , that cold fusion has been observed also by other labs
As you remember the two scientists who first announced cold fusion have been treated same as they were charlatans
One retired the other was fired by his university
Scientific comunity now apologizes with them
For sure they are not great scientists but they did not lie
The point is that cold fusion can neither be explained nor replicated
Some great scientists even doubt whether the standard model of atom is correct