The use of the salt is for a means of draining the blood. Meat that has been slaughtered according to Jewish Religious Law and is not Salted Must be washed down every 3 days. Once its been salted the watering down every 3 days is no longer needed.
So its not the Salt that makes the meat kosher but it is the Unsalting that might render the meat that was properly saughtered no longer kosher, if it wasnt washed down before the salting took place.
I would consider it very Misleading if the pkg has been printed as you wrote. Theres actually mags and websites that deal with the Mislabeling , theres alot of it. Along with the Misuse of a trademarked kosher symbol, eg, the OU that was mentioned above. Sometimes the Kosher authority has removed their agreement with a company for many a reason and the company will still package their product with the symbol still on it, other times a company has it on its pkg without ever having been declared Kosher by them. Sometimes its an honest error, numerous times its not and the product itself was never Kosher to begin with.
As for obtaining Kosher food, its alot easier today then ever before, especially in the US . Harder in Europe,Asia etc. One might not be eating meat but theres enough Junk Food out there so one will not die. Besides between fruits, vegatables and Tuna thats marked Kosher its a no-brainer.
As for Costco, I guess it depends upon the part of the US one is in as to what if any Kosher meat products they may have. Then of cause is the Level of being Kosher, I dont know of many Religious Jews (sabbath Observing) that will eat a Hebrew National Frank, Im not saying it isnt Kosher only that most people who are Religious wouldnt eat it as the level of kosher supervision is not to a high standard (no matter what their commericals say about answering to ahigher authority). The Rabbi who for many yrs gave HN its Kosher supervision would not eat the products himself.
as for Chickhen anything by Empire is Good. (was gonna say OK but its OU, the OK and OU are 2 different Kosher supervising organizations , a little pun). Next time Im in Costco Ill look around, alot of their canned goods have proper supervision as does their cakes/cookies here in NY. ( Im not talking about the Kirkland Brand itself as say Starkist Tuna or Heinz Ketchup- I highly doubt that Id ever find any fresh meat taht is kosher).