Arrived at BOS a week and a half ago (first time re-entering the US not through a pre-clearance airport since getting GE). Arrived at the tail end of the afternoon rush, so everyone was busy (non-GE companion had about an hour wait to get through immigration). Walked past the line to empty GE kiosks, flashed receipt and got waved through immigration by officer who was dealing with someone else. I had an O (answered yes to the food question), but customs officer at GE exit only asked about the candy pizza box I was carrying, no questions about anything else to declare.