Be Careful With UPS!

Your 1st "HUGE" mistake was to not ensure that the package was shipped "Signature Required." Especially when dealing with scammer latent ebay. When you ship a package signature required, for example, even if UPS shows up at the wrong address with your package, they wouldn’t be able to deliver the package because you wouldn’t be there, with proper ID confirmation, to sign for it, therefore, at the very least,  UPS must hold the package.  

They don't confirm ID.

Maybe someone with inside knowledge can confirm UPS capability: I had a package listed as delivered but our Ring doorbell confirmed that UPS had never dropped off the package. After navigating the UPS customer service tree it was communicated that the missing package would be relayed to the driver. The next day our local UPS driver came by to discuss what happened. He showed us a satellite picture (presumably printed from his hub) of our house and neighborhood at the time of delivery with the UPS truck clearly parked outside our neighbor’s residence. He was able to retrieve the package for us while explaining that a different driver had been covering our area since he was on vacation during the initial delivery. 

I was extremely surprised that UPS had this capability and unsure how that’s even possible given the amount of packages that are delivered on a daily basis across the globe. Our delivery driver kind of implied that he wasn’t supposed to show us the images, which piqued our interest even more. 

Heavily dependent on the quality of driver. Been through a few lately with very mixed results. Finally have a good one - for how long I do not know.

I've been shipping with UPS for decades, never had issue like you guys. But I always get shipping insurance and require a signature. That IMO is the key specially on expensive items, above $500 generally. I think its the insurance (this defaults to signature required) that helps push better tracking, delivery reliability, etc.