The risk of cross-contamination from an inanimate surface is low to nonexistent.
the link says that it can be infectous up to six weeks but you said the risk is low to non-existent. How come?
Because, as Idyllic said, that method of exposure rarely produces an active case. As has probably been said before, Hep C is a blood to blood transfer.
The chances of it happening the way you experiences are almost impossible, BUT, since, it the blade did have active virus on it and the cuts you received were very deep it is POSSIBLE, so they have to list it.
I agree with Idyllic, under the conditions you described, I believe you are fine.
However, if you are still worried, wait the 6 months and get a Hep C Antibody test. Cheap, fast and at that point, so accurate.
Good luck and blessings. Pat