Never-Ever-Ever send out the original. You can make a copy if necessary and get a medallion guarantee at your/his bank. The POA is needed to take control of any outstanding accounts. They may say they want the original but legally they can function with a medallion guaranteed copy.
It may depend on state law. When DW sold FIL's house the title insurance company wanted the original copy of the POA. Our response was "We'll check with the attorney" who said that was a rare exception to letting go of physical possession of the original. In our case there was a duplicate original but we didn't tell them that.
They did send it back with no issues but still, we didn't like it.