In # 1 I'd say yes to some lead that someone has melted in a mold. Those 2 in the lower left looks to be Fuel oil filters from someone's old furnace. Probably steel pot with a cast alum. top part, maybe brass fittings. The wheel looks to be cast alum. If that is solder at the top; made sure it's not an acid core solder, that can be dangerous if not handled correctly. In # 3 I'd cut the conduit into 8' or 10' lengths with a sawzall and pull the wire out. Even the price of #2 insulated would be better than if it went with the conduit on.
In #4 I'd burn that pile unless it's outlawed in your area, best way to get that insulation off. This is just my 2 cents, and what do I know??? that's what I keep hearing,,,:confused: