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Your local USCG station should have an orange dumpster in their parking lot where they accept used pyrotechnics, or some other program to take them.
If not, go to your local FD who will probably tell you to soak them in a bucket of water then thrwo them out.
Those that are not damaged are usually fired off on the 4th of July or other holidays for the purpose of getting familiar with pyros. You'd be surprised at how wimpy they are.
For future use, you might prefer to stow all your pyros in an airtight container--not the pretty orange junk usually sold with them, but a metal ammunition can or similar. When they are stowed air-tight, they essentially don't degrade and the outdated ones become useful spares.
Our pyro tin is an ammunition can, repainted gloss white then international orange, so it is quite visible. It is labelled as such, with an inventory listed on it, and the caution "DO NOT OPEN EXCEPT IN EMERGENCY".
The metal can also gives you extra protection against one going off by itself from spontaneous combustion--which combustibles sometimes do.
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