In Shulchan Aruch Yoreh Deah Siman 118 Sif 1 it says that wine, meat, and pieces fish (where the signs of the fish are no longer recognizable) that are sent using a non-Jew needs to have "shtei chosamos" (2 seals.)
I saw the claim recently that gefilte fish in a jar fulfills this requirement of having 2 seals because of 1) the printed label has the reliable markings of a kashrus organization and 2) the fact that when you open the the jar for the "first time" you hear a "click" when opening it because of the vacuum seal.
My questions are as follows:
1) How could a printed label with the markings of a kashrus organization be a valid "seal"? Anyway nowadays could get a glass jar (whether it be a different one or the one normally used for the gefilte fish) and print a label on it with the relevant markings of the kashrus organization (along with any other branding, ingredients, other details, etc?)
2) How can the fact that you hear a "click" when opening the jar showing that it is vacuumed sealed be considered a proper "chosem" (seal?) Whether it be going out and buying my own jar, giving it a label and then closing it and using a vacuum sealer bought online (for only $9.99!), it would be fairly easy to do this? Someone could even take the regular jar with the original label, empty it out, put in the non-kosher gelfite fish and then seal it with a cheap vacuum sealer in ones own home.
How are these 2 things realiable chosemes for gefilte fish sold in a jar? (I'm speaking about a case where even though it's being sold in a Jewish store and the company that (is being claimed to have) made it might be Jewish, but the transporter (let's say) isn't Jewish.)