Learn Romanian: Unde este pachetul? Îl caut acum. - Where is the package? I am looking for it now.

Yes, îl is used for "him", but it is also used for "it" when replacing masculine or neuter singular nouns. Since pachet (package) is a neuter noun, we use îl to refer back to it.

Where is the word for "for" in îl caut (I am looking for it)?

You don't need a separate word! The Romanian verb a căuta (which becomes caut for "I look") means "to look for" all on its own. Adding an extra word for "for" would be incorrect.

Why does îl come before the verb caut?

Short object pronouns like îl, o, îi, and le almost always go right in front of the verb. Instead of saying "I look for it" like in English, the Romanian word order is literally "it I look for" (îl caut).

What is the -ul at the end of pachetul?

That is the word "the" attached to the end of the noun! The base word is pachet (package). Because it is a neuter noun ending in a consonant, we add the definite article -ul to make it pachetul (the package).