Trips does not really need to produce evidence of anything, if he knows and he is certain the product was shipped his best move is to stop doing business with (and responding to) whatever customer. This is a sources best move assuming he is right.
Obviously trip is within his right to stop doing business with anyone he chooses, but if you've been following this thread from the beginning you should realize that trip has argued for pages and pages that he was "certain" of many things.. such as his brew was accurate.. or his raws were pure..
It was not until a third party was involved that he was proven wrong, and perhaps not as "certain" as he thought..
No one is perfect and mistakes can happen..