How to say “Guess what turned up when we defrosted the chest freezer? A bag of prawns from two Christmases ago.” in Japanese

In Japanese

冷凍庫(れいとうこ)の霜取(しもと)りをしたら、何(なに)が出(で)てきたと思(おも)う？おととしのお正月(しょうがつ)のエビだよ。

Reitōko no shimotori o shitara, nani ga dete kita to omou? Ototoshi no oshōgatsu no ebi da yo.