There should be a set of orifices for each burner as well as the oven and broiler. When the unit was converted to propane, these orifices should have been replaced and the ones for gas put in with the conversion kit installation information. The kit should have been reattached near the pressure regulator.
If the kit was missing the orifices, then, yes, you are missing pieces. Check with your coworker if the conversion kit was missing. If you have the kit, it can be easily done by any appliance installer (or repair person) licensed for handling NG. (At least on our range, the conversion kit installation was straight forward. Every orifice was clearly labeled with the labels different for each burner and for the gas/LP kits (ABCD (NG) vs MNOP (LP)) .) The regulator is the only part that switched for LP or NG without the kit.
As I recall, the only tools we needed for the top burners were a small wrench (10 mm) and a small flat blade screwdriver. Remove one orifice and put in the appropriate replacement. Then adjust the burners so that they didn't blow out when the oven was opened or quickly turned from high to low (for the simmer burner). The oven and broiler took a bit longer. Several screws had to be removed to get at the orifices. Then the air flow had to be adjusted for the incoming gas.
I hope this helps.
Cindy Wells
(the conversion installation manual was on the counter during installation; I read it while it was open.)
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