Kindles left in the seat pocket are my speciality, so far one left behind on a BA A319 and one on an AA A321. Neither ever made it into the respective lost property systems. A phone I left in the oneworld lounge at LAX was found by staff who insisted that the only way I could retrieve it was to collect it in person. I haven’t been within 1,000 miles of LAX in the five years since so for all I know it’s still there.