Below you see the black-colored retail package of the Samsung 850 PRO 256GB SSD:

The drive is packaged in a standard 2.5-inch 7mm z-height enclosure.

A Samsung software optical disc (Data Migration and Drive Management Software ) along with an installation guide and a warranty leaflet are bundled with the SATA drive:

The drive came with firmware Ver. EXM01B6Q installed and as you see below, the available capacity for the user is 244.198 MB (256GB drive). The difference is mostly the conversion of GB to GiB plus a bit of space set aside for over provisioning that the controller uses to maintain the drive over time in an effort to mitigate performance degradation.

The readout on CrystalDiskInfo shows that both NCQ and S.M.A.R.T. are enabled, as well as TRIM and DEvSleep: