GW 8.0.3 hp1 on Netware 6.5 sp 8

Amount of purgable space on the Netware volume is climbing significantly
each day. I have flagged the folders as PI using

flag <directory_path>\* P /S /C /DO

but when I run purgevolume vol1 it still shows files being purged in
directories that are marked as PI. I have double checked the properties
of some of the folders and they do in fact show as PI.

Any ideas why these files are not getting purged immediately?