If it were me, I would call and ask the church secretary for the nedded information to complete the CTR and update the bank's records. There is no reason for them not to give you the info, but if they refuse, mark the fields unknown (should be ok since the transaction occurred via night drop), document my file that I called, asked, and was refused, then decide if them refusing to supply you with the information warrants a SAR filing.
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I can't herd the cats anymore, so I just set up the electric fences and let them fry when they stray out of bounds.