Haddest in is an informal and archaic term that is rarely used in modern English. Instead, there are several synonyms you can use to express a similar meaning, such as possessed, owned, held, or had. These words are classified as simple past tense verbs. In casual speak or writing, you can replace haddest in with "had," which works well in most contexts. You can also use phrases like "had in your possession," "held in your custody," or "owned previously." To avoid using outdated language, it is best to know and use simpler synonyms for haddest in, which make the sentence more understandable and sound natural.