It has not be made clear why they had to send silver or gold bound to the body of the victim.
Converting so much silver or gold repeatedly to currency of the current time would have raised suspicions of current law-keepers.
They could have sent silver or gold separately to Abe who would have converted the same to current currency and would have paid the killer Looper after the kill has been confirmed.
This way, there would not have been current legal issues and the payment gets made only after job-done.

Film

Looper - In fuga dal passato (2012)

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