I have bought the phone just yesterday. I need the money for a emergency case that just happened. The device is totally new. You can replace the device between 10th June if you want. It has also a service warranty of 2 years. You will also have the cash memo.
You can check the device in 'Apple care Bangladesh' from where I have bought it: https://bikroy.com/bn/ad/samsung-galaxy-s8-4-64gb-dual-sim-new-new-for-sale-dhaka
*price is fixed.