T 483/17 - 'more up to the hilt' is not needed
The opponent in this case alleged that one of its own products is novelty destroying prior art. As this prior use lies within the sphere of the opponent, proof 'up to the hilt' was required. The board's analysis of this proof is very case-specific of course, but makes for interesting reading (if you're into that kind of thing). The proprietor makes a good effort to find inconsistencies in the provided proof, which leads the Board to state at one point that if more evidence was provided, it 'would merely have been proven even more "up to the hilt"'.
In the end the opponent manages to prove to the Board's satisfaction that it really did sell a product that falls under the scope of the claim.