OSEPP 16x2 LCD Display Turns On But Does not Display any White Boxes
It is normal that these displays start up with some lines displaying as all white (and others all dark). That's just how they look before they were initialized.
However, as mentioned above, you forgot to wire the data lines. Pins 7-14 from the display need to be wired to the Arduino, typically pins 4-11. But that depends on the configuration in your sketch. It may also work with only 4 lines, then you would connect pins 11-14 from the display to the Arduino pins 4-7 and configure the display to use 4-bit mode in your sketch.
That said, there are more wiring errors in your picture. The lower pin of your potentiometer is unused, and so like this it has no use (and you cannot control the contrast of the display, also making the text, if there is any, hard to read). The bottom pin of the potentiometer must go to pin 3 of the display (remove the line that is already there).