乔迁 is from
《诗经·小雅·伐木》:
出自幽谷,迁于乔木 ('emerging from the deep valley, moving to a tall tree') - originally a bird-migration image used as a metaphor for rising in life. Modern use extended it to 'moving house', making
乔迁礼物 literally 'gift for moving up to a taller tree'.