Knives
Brought a few nice knives in checked luggage with us a couple months ago. I put them in janky cardboard sheaths I made with duct tape so they did not look remotely new. They were not questioned.
Of course, I was shook down over some other BS that I shouldn't have been, so I think they were just using the first thing they could find to squeeze me. Didn't say a word about my electronics that could have been a legit question for receipts.
Bottom line, if just visiting I agree it is not worth the risk for knives you really care about. It is expensive when they squeeze you and you don't have the time to fight it.
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