The fines and the receipts come in almost identical brown envelopes and they just slipped through the net.
Times, Sunday Times (2006)
He was stunned to be asked by an aide for 'a brown envelope with $500' to secure the meeting.
Times, Sunday Times (2015)
Those were the days when people would pull out their pay slip from little brown envelopes and compare each other's earnings and deductions.
Times, Sunday Times (2009)