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Re:Goodwill doesn't want broken toasters by Dylan16807 on Saturday May 08, 2021 @04:57AM (#27085231)
"volunteer staff" is probably close.

"volunteer" by itself is not, because it implies nothing about it being long-term.

Neither one really gets the connotation right.

Re:Goodwill doesn't want broken toasters by lostcolony on Saturday May 08, 2021 @09:40AM (#27087020)
Repeat volunteer. Long term volunteer.