I ordered a brand new phone and I received a box without a charger, with no plastic film on the screen and with a security seal that is not the original one from the manufacturer: obviously an open box!!!
When I contacted GOMIBO, they came with the explanation that they randomly perform extra quality checks and they open the boxes prior to sending them. I checked online the status of the IMEI number of the phone and it returned the information of a phone that was activated in Grece, 3 weeks prior to the order that I placed. Therefor the phone is NOT NEW. Eventhough, GOMIBO still claims that the phone is new.
Here is the copy-past of their answer: "To guarantee that we sell top-quality products, we sometimes perform checks. That check means that we break the seal ourselves to check the quality of the product. The seal that was put on the box is our own seal, that we placed over the original seal. Your product has had that extra quality check. The device that you received from us is completely new and, of course, comes with a 2-year warranty.
I hope that this explanation gives you some more information. If you want to receive a new phone, you can return the old phone and we will sent you the new product as soon as possible. However, I can not guarantee that the seal will be intact, because there is always a chance that we broke it to perform that extra quality check."
Or in other words, even if I return the phone and I am not sure to receive a box that would not be open.