I got myself another PowerMac G5 Late 2005 2 weeks ago (even though I had planned on not buying more Mac stuff but I just have a fable for that particular model). I saw it by coincidence on eBay and only few people bid. Eventually I got it for 55€ including shipping. Since I know how those machines usually turn out when not shipped in their original packaging, I messaged the seller prior to bidding if she still has the original packaging which she denied. She assured me however that she has a "special box" with inserts that will for sure protect the Mac. In hindsight I probably should not have bid because shipping G5s in anything other than the original box is asking for trouble.
As it turned out the box was not so special and the most important parts to protect (feet and handle) had just some paper around them. Needless to say the G5 arrived demolished and I kind of was shocked to see it in that state (since it ironically was advertised as free of dents – explicitly stated in the title of the auction ?). Well, evidently that is no more the case (no pun intended

) and what a waste I'd have to say

Of course I reported the incident and thankfully got 25€ back. I really don't like opening cases since the seller seemed so nice and I really do believe that she didn't know better but obviously I cannot accept shipping damage at such a high level.
So in total I paid 30€ for a Late 2005 2.3 GHz Dual Core G5. Not too bad considering the machine still works great and the innards survived without any visible damages (the case was at least good for protecting the guts of the computer). Luckily I have another empty G5 case (long story) which I initially wanted to convert to a hackintosh but now I'm thinking about just moving everything inside the demolished case over to the good one (better to keep it original than to hackintosh anyways). If so this would be my third PowerMac G5 (probably overkill to have that many but I don't have to explain myself here ?). I'm still not sure what to do with the damaged case but I think any repair attempts will be a lost cause so once it is cleared out I'll most likely trash it.
My takeaway: Never buy G5s/Mac Pros again online without the original packaging (no matter what the seller claims to provide as packaging instead), best option is to get them locally – also eBay really does protect buyers and I'm glad to have it bought on their platform (I would probably not have been refunded on other platforms where no buyer protection is in place or only at additional cost)
All in all, not a bad deal but with a sad twist. On a rainy day or when I feel like it I'll transplant the hardware over to my good case and restore this particular G5 back to its former glory.