Apple ID is locked, and i forgot my email and password

He buyed a phone from hes co worker and dont have the receipt, can he send some id to proof he identity, bc he created the apple id but forgot the email and password

No, it is the co-worker who originally owned the phone who must send proof to Apple.....because the co-worker is still the owner of the phone as far as Apple is concerned.

we just need a information for icloud, thats it

That information will depend on whether the co-worked is willing to help. The co-worker did not prepare the phone for sale correctly. Here is what they should have done:

What to do before you sell, give away, or trade in your iPhone or iPad - Apple Support

If they cannot do this, your brother should return the phone for a refund.

For the co=worker:

This article tells you the various ways you can try to discover your forgotten Apple ID --> If you forgot your Apple ID - Apple Support Typically an Apple ID is an email address you have used. If you are currently using a mobile device that is logged into your account, go to Settings and tap your name at the top. Look in Keychain, and in a browser's security settings if you use it to automatically sign into Apple when using a browser.

This article outlines what to do If you forgot your Apple ID password --> If you forgot your Apple ID password - Apple Support

or go directly to this link --> http://iforgot.apple.com/

If you find you can’t sign in, reset your password, or receive verification codes, you can request account recovery (read this support article: How to use account recovery when you can’t reset your Apple ID password - Apple Support ) to regain access to your account. Account recovery might take a few days or longer, depending on the specific account information you can provide to verify your identity.

If you still need help this page provides country-specific Apple Support contact information ➞ Contact Apple for support and service - Apple Support

For your brother: If the co-worker cannot get the log in information and does not have the receipt, get a refund from the worker. The device is otherwise useless to your brother.

Apple will not unlock the phone unless you submit an Unlock Request which includes the original sales receipt for the phone. Details below:

start an Activation Lock support request.