We provide insights into the data leakage of GIFTCOFB by performing Correlation Power Analysis (CPA) on GIFT-64 based on the Hamming Weight model. We assess the reliability of several existing theoretical measures in identifying resiliency to a CPA attack by making a quantitative comparison with the outcomes of these metrics for the SBoxes of PICCOLO and PRESENT, as well as with several other SBox variants that demonstrated sufficient weaknesses against cryptanalysis. The existing theoretical metrics that we analyze include transparency order, revisited transparency order, signal-to-noise ratio, DPA signal-to-noise ratio and non-linearity aiming to characterize the CPA resistance of the above mentioned SBoxes. We utilize the LWC and CAESAR hardware implementation of GIFT-COFB by Rezvani et. al and apply TVLA using the Flexible Open-source workbench fOr Side-channel analysis (FOBOS) test architecture.