Follow-up measurements for the transmission of 500 eV electrons through the same PET nanocapillary foil used in earlier work [PRA 76, 042716 (2007)] have been performed. It is found that considerable deterioration of the sample apparently occurred since the earlier work as manifested in substantial reduced transmission intensities and greater fall-off of these intensities with increasing foil tilt angle. It is postulated that surface contamination or an increase in capillary conductivity, or both, causing an inability to maintain charge in the entrance region, led to the observed sample deterioration.