Is it okay to wear the deployment OCP when you've never been deployed?

No. That is neither appropriate, authorized or "ok." Before attempting to "correct" him you need to make sure to straight up memorize AR 670-1. Once you've done that you may feel free to confront this individual by the regs. That being said it's important to keep in mind that he is, per AR 670-1 not actually required to wear all awards, patches and deployment swag he's entitled to at all times.
You also need to keep in mind that if his peers aren't already sorting him out you're probably going to get your ass pinned to the nearest wall for messing with him. But that being said it sounds as if you'll at least be in the right on the matter...

It is a uniform not a combat patch so yes he can wear them he got issued them.

His unit may have deployed and he was supposed t go with them but for some reason he didn't

He can wear it because the Army allowed all soldiers. You can too, if you happened to find yourself one. :)

Pfc- I a world of messed up things, why would you choose this to be curious about? There is absolutely nothing wrong with wearing "deployment" ocp, also it is correctly called multicam. And as a point of fact there are several soldiers in my unit that have been issued multicam, and deployed but DID NOT receive a combat patch. Why? It was not a combat deployment.

Also a lack of medals and awards on duty uniforms doesn't mean didly. Just because you are entitled to wear certain awards does not mean you have to....

This link should help. https://www.army.mil/e2/c/downloads/396739.pdf

Like an old 1SG once told me, "don't wait for the movie, read the book". AR 670-1 should help you out. Good job trying to get clarification before you attempt to approach him. Good luck.

DA PAM 670-1 does not stipulated that a deployment is required to wear the OCPs. As long as he is in compliance, there is no issue.

Could have been passed on or purchased.

Check AR670-1. Best to find the answer for yourself directly from the source. Asking other individuals what is right or wrong may vary due to different duty stations and commanders discretion, thus you may get an answer that is wrong, but not perceived as such. One standard. The army standard.

Isn't OCP the new uniform everybody wears? Multicam were used for some deployments but are also authorized as well.

Technically, it's not expressly forbidden... So, in some minds, it's implicitly allowed. My personal opinion - it's not right.

I was supposed to deploy with my unit got all the gear uniforms etc and then 48 hours prior they cut the numbers and now I'm not goin and I have the uniforms

It could be that he bought them from somebody who deployed, but no longer wanted them. And they were not deployment OCP, they are MULTICAM. Google private, Google.

They were only issued for deployment. He may have drawn them then not deployed or gotten them second hand. My buddy gave me some
FRACUs that weren't on her clothing record.
It's still authorized for wear wether he deployed or not.

Umm, did you ask that person?

I was in the 82nd for the last 4 years and I have a similar situation. I got to Fort Bragg in September of 2011 my brigade was picked for deployment for March 2012 so everyone was issued multicam with about a month left before the deployment me and several other soldiers from my battalion were told we aren't going and when you go back to cif to return all your rfi anything that touches skin ( even if you never wore it) doesn't get turned in I.e uniforms, combat shirts etc... when the new uniform came out it was put in the regulation that you could wear the ocp up until fiscal yr 2019 when they make the new uniform mandatory so I've been wearing my multicam because it was basically like having 4 brand new uniforms not saying he's in the same boat but he could be

Pfc should be doing research instead of asking.

Most likely he was scheduled to deploy and did not deployed in the end. He was most likely issued dployment uniform then.

If its an authorized uniform then its an authorized uniform.