571 and 572 led a bit of a nomadic life after leaving Chester. Spent time on Wearside and Winlaton, before ending up in their current liveries.

Can't remember 566 to 572 being in Chester for long prior to the 2006 changes, as the Metroriders were still kicking about on the Chester town services and the 177/178.
That's not to say they weren't though. Just can't remember seeing those few vehicles amongst the Metroriders.

Edit: I think I can remember the 734 being worked by a couple of MPD's, prior to the 2006 changes. The PVR would mean that it wouldn't require all of the vehicles mentioned.