ボックス:Box
に:A particle, direction. in this case, “into”
入れた:[verb] past tense of the verb, 入れる, to put things into something
物(もの):thing
は、:a particle, subject marker (after the subject)
返却(へんきゃく):[noun] return
できません:cannot do
カブ:is a name of vegetable, and at the same time, it is a stock.
高額(こうがく):High price
買取(かいとり):purchacing
店内(てんない):Inside the shop
のみ:only
の:a particle, noun connecter
取(と)り扱(あつか)い:[noun] (products) handling, dealing