best way to analyze a subset of DE genes

Hi all,
I have the RNAseq data for an experiment, with data under two condition. I've performed the typical DE analysis using DESeq in R. On the other hand, I have a positive control genes from the lab, but unfortunately, those genes are not DE in my analysis. So now, I'm wondering if there is any way or a different analysis that I can do to see if those genes have any effect at all in both conditions or if I should think in other strategy.

Thank you very much.