I definitely think that you should leave it up to him as to what he wants to do with that stuff. You're right, he probably doesn't even know he has it, but to me its a respect thing. I am big on the mutual respect in my relationship with FI and I just think its so important. Besides, if you threw them out behind his back you wouldn't want that to come to light down the road. Even though he probably will want to throw them out anyways, at least you're making it his decision by talking about it. Good luck!