OP, if your goal is to sell it, keep in mind that firstly, aluminum currently runs less than a dollar per pound in most places, maxing out at 2 bucks a pound during shortages usually. Unless you're melting down the cans, and collecting bricks of the stuff, you're not going to feasibly be able to keep enough aluminum to sell to make it worth the costs of not just melting it down, but storing it. Also, a one pound brick of aluminum still sells for the same as a pound of aluminum cans, and still takes up space, albeit less space, if you're talking a quantity that is worth selling or bartering post SHTF, you're talking a LOT of aluminum, and in the event of SHTF, if you have to bug out, you're now going to have to worry about transporting all that technically useless metal.

Aluminum is not rare, it's not valuable, and it's not worth much now, and won't be worth much to barter in the event of full societal collapse. Aluminum is found in so many products, and since it's not survival essential, it won't be something taken from supermarkets and other sources, so the people who actually have a use for aluminum won't need to barter for it and won't need that much of it.

As for copper, if you're talking cords, you're also talking about an already formed and worked form of copper. Sure, pure bright copper can sell for as much as $10 a pound to the right buyer, in mint condition or pure form, but in used cords? MAYBE 50 cents a pound. It's just not worth much, and since you're talking cords that don't even work, you're talking about even less. Again, you could in theory melt it down, but insulated copper cordage is not pure, and you would lose about 30% yield from a melt and pour. One pound of copper would melt down and slough down to about 11.5 ounces of copper, so if you were making one pound bricks for example, you'd have to melt down about 22 ounces at a time, and again, now you're talking about a metal that not only is still not perfect, it's been previously ionized, not perfectly ideal for electronics or cordage, also not ideal for circuitry, and very vulnerable to oxidation, which would further dillute any value it has, and still wouldn't sell for much more than it did before.

In a SHTF scenario, full societal collapse, the only people who would actually have an interest in copper would also have knowledge in how to find it in bulk, at high quality. And if they DID need the copper you had, again, it wouldn't be worth much, as it is very common, easy to work with, easier to acquire, and worst of all, only has a few post collapse uses. Wiring, cordage and circuits at best, and even then, that's gonna require someone with the knowledge and tools to do so. Otherwise it's just paperweight metal or something good for really cheap tools and weapons.

Gold and silver as well have limited post collapse use. Gold is valuable because our economy and technology based society makes it valuable. Rings, motherboards, jewelry, circuitry, lasers, magnifying microscopes,,etc. Silver is much the same. It would sell well to the uneducated, but then you'd inevitably come across one of those people who say ''and wtf am I gonna do with a bunch of shiny metal chunks? I can't exactly buy land and food with it'' and you'd be dead in the water. And for their prices nowadays, they are immeasurably not worth the purchase. Gold and silver are only valuable in an intact society, and only if you buy low and sell high, and those markets are purposefully guarded and full of fakes, scams and worst case, low quality metal not actually worth anything.