If more money than needed was collected for a captive:<a href="#_ftn1" name="_ftnref1">[1]</a>
When collecting money for a specific captive any extra money collected belongs to the captive. However, in times of need, the community leaders may decide to use the money for other purposes.
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<a href="#_ftnref1" name="_ftn1">[1]</a> Michaber Y.D. 253:6; Mishneh Shekalim 3a

Shulchan Aruch HaRav | What to do with the excess money that was collected for a captive

If more money than needed was collected for a captive:[1] When collecting money for a specific captive any extra money collected belongs to the captive. However, in times of need, the community leaders may decide to use the money for other purposes. ____________________________________________ [1] Michaber Y.D.