I get to Pickles a fair bit and keep a keen eye on the XR's passing through there. I've found a couple of important points to watch when choosing an ex cop XR from them.
Be very aware of underbody damage, whilst NRMA are pretty good at identifying this, have a good look yourself.
Check all rims and tyres for signs of scraping and rubbing, including the spare, a pretty obvious sign of being hammered around town.
Replace all dash, A-pillar and centre console items with new ones, after the cops drill the living daylights out of them, they are very cheap to replace and are bloody easy to do.
Try, Try, Try and find out where it was stationed. Check service stickers, in the boot, under the bonnet etc. Of the many that I have looked at some very big differences are found between the country NSW and city cars. Country area cars are by far the more cared for cars as there is usually only one driver for them, whilst a few stone chips may be there it sure beats the bump parking, general city flogging that they get in metro areas.