Chimera has always loved to put things in his mouth and chew them up. I've managed to change that to putting things in his mouth and bringing them to my hand. However for training Match to Sample, I waned an indication behavior that won't involve always messing up the objects he's choosing from. I chose a sustained nose touch. Today I finally got a nose touch to every single one of the 13 kinds of objects I've set aside for this training.
We'll still need to repeat this a handful more times before the nose touch is fully reliable. Also, realistically, the nose touch will still slide them around when he's indicating, but at least he won't be destroying the object.