Have you find or had you found?

Answer 1

"Have you find" is not correct. "Had you found" is correct, along with "have you found", but their meanings are different: "Have you found" is in the present perfect tense, and "had you found" is in the past perfect tense.

Examples:

Have you found the answer yet?

Have you found a dress to wear to your cousin's wedding?

Had you found your notes in time to study for the exam?

Had you found the illegal drugs before the police found them?

Answer 2

"Have you found" is the correct phrasing. It is used to inquire about a person's current status regarding the discovery of something. "Had you found" is past perfect tense and is used to ask about a completed action in the past.

Answer 3

You could use "Have you found your pen".
Also "Had you found your pen you would no longer need to search"