What should be done with samples left over from quality-control testing?

Firstly:
those who are responsible for requesting samples for quality-control
testing must ask for the amount that is usually sufficient for testing,
and not ask for or accept more than what is needed.

Secondly:
in cases where only some of the amount given is sufficient, whatever is
left over must be handed back to its owner. His address should be written
down on the sample, and an appointment should be made to give back
whatever is left over from the tests. A name of a contact person and an
address should also be obtained, so that the goods may be returned.

Thirdly:
in the event that the owner of the goods or his representative does not
keep the appointment, and there is the fear that the samples may go off,
then they may be sold and the money raised should be given to Bayt
al-maal al-Muslimeen (the treasury of the Islamic state). If they
cannot be sold, they should be given away to the people who are usually
taken care of by the bayt al-maal.