You have to follow all the rules to a Tee. Use the Ebay system to buy the postage, over $100 gets adult signature required by me, end of story. I don't care if you won't be home or not, you sign for it, no exceptions.
I plainly put that in the descriptions of everything I sell. Had a few request otherwise because "not home much!"- too bad.
With higher end goods, I also document what I can showing the item works fully- Sold Macbook a few years ago to some chick who got it and then figured she got ripped off- tried to tell Ebay it was defective and wouldn't boot, etc. etc.
Problem for her was, I had a PHOTOGRAPH of the results of a system check done by the Apple store, with it clearly showing the date, and "No problems found"- the pic was in the initial listing.
She lost, of course.
I photograph and show all Serial #'s, pics of item working, on and on.
I had one instance where I bought an defective amplifier from a guy who claimed otherwise, some POS scammer who trashes everything he owns. I complained it was DOA, he said I tampered with it, Paypal tried to hold me to it, until I proved his claim was false, so Ebay let me keep the item and I didn't have to pay. Got a refund because the seller raised hell. Ebay wound up eating the whole deal.
I got to leave one hell of a negative feedback tho on the guy.
Ebay has been good to me over the years, but it's all because of good CYA.
rjp