RECTYPE & CASEID not appear when download

I am using R software to work on ATUS data. When I download the dataset and open in my R, I have noticed that RECTYPE and CASEID does not appear in my dataframe - even though I made sure to have them selected when I download. In fact, in my [ddi] I can see that there is RECTYPE and CASEID as variables. Can anyone offer some insight to what’s going on?