Saying either "Did you find your helmet" or "Have you found your helmet" is ok. You should note that in the second sentence, if you use "have" as a helping verb in the present perfect tense, then you have to provide the past participle form of the verb "to find" which is "found." By the way, when communicating here, I suggest that you use correct spelling for everything you write. Using abbreviations like you see in an internet chat room is, in my opinion, counter-productive to learning a language and it will cause you spelling problems in the future. So, to be clear: not hv, but "have;" not ur, but "your;" etc. I say this not as a criticism, but to help you. Good luck in your future studies.

Lee is absolutely right. I'm sorry to say this, but ' hv u find ur helmet' is rubbish. It isn't language at all. It's just a collection of random letters. Whoever told you that this was an acceptable way to write English has done you a great disservice. If you want anybody to take you seriously, you need to: 1) Write proper words 2) Use capital letters 3) Use punctuation 'Did you find your helmet?' is normal English. So is 'Have you found your helmet?' Either of these is fine. Sequences of meaningless letters such as 'hv' 'u' and 'ur' are not.

Did you find your helmet? Have you found your helmet? Hope this helps