Let me tell you a little bit on this, you can take made in china items for personal usage, but coming in bulk like wedding favors the custom people thinks you want to sell, and since those Chinese products are high taxed to be imported ( 60-80% from its original value), if you don't declare and they find bulky amounts probably they will think you are doing something wrong...
I had buy from OTC , ship the items to Texas and then going personally to pick it up and bring the things with me to Monterrey, and I was kind of nervous, but I took all the marks, mixed with my cloths in the luggage and did my regular custom procedure.....
Don't panic just be cautious...