There is ‘undelete’ freeware for the iSeries, however everthing I have read only talks about record undelete not file undelete. I know if you did a reclaim storage it would get rid of the spaces marked deleted, but if your object level security is correct what difference does deleted objects make?
If they’re hitting you with this now, I’ll probably get it on our next PCI audit. One of us should download the software and do a test. If I get to it first I’ll put the results out here, but it will probably be several weeks before I can get to it.