I was also wondering if the wood had been 6/4, but saw that the OP was clear that it was 4/4.

Did your receipt just give a total price, or did it say 55 bf @ 7.99/bf (etc.)?

If your boards are uniform length, it is pretty easy to stand them up side-by-side and measure the total width with a tape measure.
You can then multiply out by the length to get a good approximation of total board-footage.