He also said the salesman told him certain options were in it ... but weren't, and he didn't look personally.
Which means, the deposit contract did not state what was in it and what wasn't.
Remember, if it ain't wrote down, it's "he said, she said' and the courts won't enforce it if it ain't "show me".
Same thing that happens all the time. Salesman only cares about selling the unit, and will tell you "Hurry up, another guy's getting his check out" ... and then the buyer makes the "Grand mistake of all mistakes" and writes a 'hurry up check' before all the ducks sit in a row.
Buyers always learn these lessons the hard way. How many times has it been said on this site and a million others. "Get it in writing BEFORE you sign the checks."
Why do we have to write that on the head of a nail and drive it into the center of a buyer's brain before s/he gets it.