I no longer reply to frivolous posts but yours caught my attention.
The contacts you have are of a silver alloy plated onto the rivet, to recover the silver I set up a wet grinder similar to one used in lapidary work then using a pair of pliers to hold the brass ground the silver free from the base metal saving the grindings to be further refined or sent out to a refinery.
Once you have several pounds of filings you could recover your silver via hydro-metallurgy or pyrometallurgy or send the material out to a commercial refinery for toll refining.
Since the contacts could possibly contain cadmium in their alloy make up I would send then out for refining, a much environmentally and healthier solution for both you and your neighbors.
Silver contact sources, hot water tanks the thermostats, electric ranges thermostats, washing machine and dryer timers to name a few.
On days having high humidity cutting the capillary tube on the oven thermostat can catch fire as the tube and small bulb that resides inside the oven are filled with sodium metal which react with water to self ignite.
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