I just joined the community and realize this was posted quite a while ago, but thought I would respond anyway.
When I started this job 2 years ago I had the same mess (4+ years of crap). The key to cleaning it up is creating a meaningful, legible, organized Unvouchered Receipts Report. The dataset available to the standard 04.700 report provides accurate information, but needs to be presented more clearly.
If you have not already resolved this problem, let me know and I may be able to provide you with several Crystal reports (including PO Status/History) which are much better organized and may be helpful for this potentially daunting task.