From my experience, on the customs form (taxes, handling) if it says "Opened", it usually means everything. The box opened, the knives examined (opened, closed, flicked). Basically if you see yellow tape on your box, it means someone at customs played with your toys.
Oh, and about a year ago I wrote a really mean post towards Canadian customs on Canadian Connection subforum here. I ordered a Buck 110 (folding blade) and Spyderco Ronin (fixed blade), and it was opened and examined by customs. Unfortunately, after examining it they did not put the Buck folder in its box, and the DID NOT PUT the Ronin into its Kydex sheath. Considering that the knives were shipped in a padded USPS Global Express envelope, this was SOOO STUPID. When the mailman gave me the envelope, I didn't notice the cuts, but the envelope was sliced many times from the inside by the Ronin. Those who have handles the knife know it has an extremely thin, freakishly sharp tip. The mailman could have EASILY sliced his hand in up into ribbons, it's a miracle he didn't, honestly.
I wrote a pretty self-controlled letter the next day and attached a picture of the envelope and unsheathed knife, and explanation that the Kydex sheath is tight and the knife could not have fallen out of it on its own, and Buck 110 didn't just open its own box, jumped out and closed it afterwards. It was an idiot at the customs who after opening the packaging didn't bother to reapply it, or even sheathe the blades. Of course the letter was ignored, nobody phoned me with a followup, nothing. Usual bureaucratic bull.
Nobody got hurt, although the next time I saw my mailman I was half expecting him to ask if I had something sharp sent to me because his bag was shredded from the inside. But he didn't, so I guess it's all settled. Still, made me mad as all hell.