Wanna laugh?
Take a look at salt, on a supermarket shelf. It too has an expiration date. "Ohh Heeeeerb?"
The silver lowers the solder melting point by a couple of unnoticeable degrees. But I like the "WATTGATE" gold plated duplex receptacle! "For audiophiles who insist on providing the very cleanest power to their expensive system ($169.00)"
There is no way in hell a 2% silver alloy will "improve" music or anything else. So sorry. It's main function parallels the "Wattgate Effect". Silver has poor resistance to atmospheric corrosion. No! Silver oxide is not a great conductor.
Lead/Tin/Bismuth on the other hand can reduce liquefaction of the media by 20+ F which can be critical where overheating a component would be a real danger.
The mast anchor light on the Kelley II, was a 40 watt 130V incandescent bulb, that had a 6-amp 1,000 PIV diode in line. I soldered the mast wires to the bulb tip and threads, then dipped the entire brass base in hot tar. Last I heard, the 1983 installation worked just fine. All done with 63/37. Nine and one third 5 pound rolls of it used on the vessel.
That shelf life hocus pocus is focused on the resin. Burn off a piece rather than snip it and the resin on the roll is sealed............duh! It's @#$%^&! like this that makes me an authentic cynic. I just purchased a quarter pound of ARCTIC SILVER EPOXY. "They say" shelf live is 2-months, refrigerated. They do not say anything at all about shelf life at -0F............duh!
By the way your salt "expired" on 4,329,652,208 B.C.
Whose to blame most, crooked companies, or 3-Stooges grade, general public? Golly gee, I came automatically with a Lifetime Warranty. Warranty extension plan not available...