I wouldn't bother too much about recording the packing process, just a photo of two of how it was packed (to show you didn't just toss it in a box) is fine. Just because you have a photo or recording of the item in a box, doesn't mean that it's proof THAT item was sent.
I suggest you read and be aware of your responsibilities under the Seller Protection Policy (both eBay's and PayPal's since they are two separate companies). Keep a record of the exact weight of the article (as measured by the carrier). I one had one guy try to claim that a large part was missing from a package I sent him, however a quick phone call to Australia Post and DHL confirmed that the weight never changed at any part of the journey so the part *had* to be in the box. I confronted him with this and he fell silent.
Only ever send an item to the address listed on the buyers PAYPAL account, send it to anything else and you're not covered (if their address listed on the eBay order page and the PayPal 'payment notification' e-mail differ, make further inquiries).
also state that you are not responsible for shipping issues, Ala usps, ups etc.
Stating this won't automatically reduce your liability. You still need to comply with Policies. The seller is responsible for the package up until the time it's delivered (and you need to prove delivery in the case of a claim by the buyer). This means ensuring it's suitably packaged and labelled. Pay the extra for insurance/coverage (even if the buyer doesn't want it). If it's damaged or lost in transit, you can make a claim. Also request a signature upon delivery.
You can also look up eBay user's telephone numbers through this process:
http://pages.ebay.com.au/help/buy/contact-member.html#requestingAs Weistek already mentioned, be descriptive when listing the product and be open and honest about any issues. Also be clear about how you ship your product (for example, if you don't accept people picking up the item, then say so). So many eBay users just assume they can call the shots at least if they haven't read your listing, it's their problem, not yours.
I guess finally, if you have a buyer who hasn't paid, open an unpaid item dispute at the earliest opportunity.