I pulled GIS for Westchester County NY and find no owner by name McCabe. Provide your sauce, anon or don't make statements like that please.
Several reasons actually. 1) they want to remain anonymous; 2) claims have been made that the transponder pulls too much power and can cause a fire in certain older planes; 3) it's just not required for private planes to squawk…it's optional. Therefore, make sure the entire flight looks suspicious - otherwise, you'll be finding things daily that are truly normal.