Does the US consulate keep the I-134 form with them or do they return it back ?

Question

Does the US consulate keep the I-134 form with them or do they return it back ?

Answer 1

They return.

Answer 2

It depends on why they have it.  If they asked a nonimmigrant visa applicant for it (unlikely) or if the visa applicant just brought it along, they may or may not give it back, and may or may not even look at it.  If it's part of a immigrant visa application, it stays with all the other documents.