It might have voluntary unpaid staff but it probably has a paid manager.
From experience I can tell you that some managers are skimming a f****ng fortune out of the charity they work for.
Fat bird with big t*ts (they normally go hand in hand) who was the manager says "Put that into the unsaleable bin please" to the voluntary unpaid staff member.
Unpaid staff member to Adam 24 hours later "It's no longer in the bin but on eBay for £45 buy it now on her eBay account"