Some electronics items come out with an E. They need to be sent back with CRC for recycling. They print out on the CRC list, so they need to make sure they are packed with the day's CRC and not put in ESIM. Technically there is a big list on an email that some of them need the special electronic stickers (but not all of them) but we gave up slapping the extra stickers on them. Ain't nobody got time for that.