Poacher's Knife Suggestion
As a jungle main, the Poacher's Knife is quite the underwhelming item when compared to the other three smite enchantments.
Like Riot has stated before, nobody actively counter-jungles to the point that they are always in the enemy jungle. It is usually an opportunistic tactic above all else and junglers, like myself, do it from time-to-time when given the opportunity.
If you ask me, counter-jungling is not just about denying the enemy of their camps and then running away. Counter-jungling is also knowing where the enemy jungler is and using that information to avoid potential ganks from the enemy. When I counter-jungle, I always have some spare wards with me so I can place them in the enemy jungle for this exact reason. Spotting out the enemy jungler does wonders for your team and it allows your team to instantly adjust their playstyle, thus avoiding unnecessary deaths due to overextension.
My proposal: What if Scavenging Smite gave you a free stealth ward when used on a camp in the enemy jungle? Much like the old Quill Coat, the extra wards will greatly help denying successful ganks from the enemy jungler because of the deep wards. Like the Quill Coat, there should be a cap of 2 wards that you can have from Poacher's Knife. The number of wards will be stored onto Poacher's Knife itself so you will not need to sacrifice an extra item slot for this benefit. Obviously, these wards can be destroyed via Sweeping Lens or a Vision Ward, like any other stealth ward.
This way, even if you leave a small monster behind, you can still keep track of jungle timers because of this free ward watching over the camp. It would be much more rewarding than just simply taking their camps and running away because, with this extra ward, you will eventually be able to spot the enemy jungler before he is aware of your ward.