Most us don’t know what has value and what doesn’t. The people who process those donations do.
We all know, from reading this thread, that pre-euro coins from France do not have value. A quick Internet search confirms that they stopped having value in 2005.
Those collections are for coins you acquired in current travel, that are still being used as currency somewhere.
During my recent trip to Iceland/Glasgow there were envelopes in the seat pockets of the IcelandAir planes for donations to a children’s charity.
…to be made with valid currency. Old currency is just bits of metal.
Or, again, Ebay. I wasn’t kidding about selling them in bulk there, they are sold every day. One example:
(I see that seller has sold over 1000 of the 10 pound lots.)
If I had thought of it I could have put in one of the 1000K notes I had left over. I think it was only worth about $8 US.
I have some demonetized bills with pretty startlingly high denominations.
ETA: When I rented an apartment in Israel, there was a big bag of these valueless agorot stuffed in a high-up cabinet:
I have one of those Zimbabwee bills somewhere in my office. I bought it on eBay years ago for about $2. Most of which, I suspect, was for mailing.
I do love my 2 mil coin from Palestine:
I have a bag full of them. I plan to put a listing up on the local free stuff site for anyone who might have kids starting a coin collection or just wanting them as play money. There might be a couple of dollars worth of still valid coins in there, but only back in their various countries of origin.
I also have a hundred-odd old French francs from the '60s and '70s that I use as game markers.
Back when Ebay was pretty new I bought a batch or two of bulk foreign coins. I haven’t looked at them in years. Some of them have corroded a bit, others still look new. Lots of them from the 1930s-1940s (I like the thickness of the several old Brutish threepence coins, and have one of the old huge pennies). A few of them (dime-sized or smaller) are probably silver. One of them was even an 1896 or 1898 US quarter that has seen much better days.
Delicious!
Maybe a coin shop? Some collectors may want to add obsolete coins to their collection.
I have a few of those silver three-pence(?) coins.
Plus assorteed foreign coins from my travels and especially from my dad. I’m assuming for example Mexican coins from the 1950’s aren’t worth much.
I have a lot from my travels, paper money too. ( Including a million Inti note from Peru. ) I recently saw a clever idea, they picked out only the choicest most meaningful coins, and made fridge magnets from them.
That kind of appeals to me. I am considering it!
drill a hole in them and use them as washers
Test them out in vending machines. The French 20 centime coins (worth 4 or 5 cents at the time) used to work perfectly as quarters.
When some mechanics want to clean out an old, sticky, rusty gas tank, they often attack the interior of the tank by pouring a pail of nuts (as in: nuts and bolts) in the tank and – with or without added liquid chemicals – agitating the tank vigorously in order to let the nuts gently abrade the degraded surfaces within.
When you restore your next vintage automobile, you won’t have to do anything as pedestrian as they do. You’ll have obsolete foreign coins to use 
Gear head-cum-bon vivant!
My youngest had a large container with all manner of foreign coins and bills. My job in Europe was to travel all over doing work for the State Department. When I got back from a trip I’d give him whatever was in my pockets, other than larger bills. When we moved, his collection was stolen by the movers.
Because theft is cool