Rikko,
I appreciate your candor.
If your employer is picking up shipments, is he dipping them himself (cherry picking) or is he calling in an order and showing up on the dock to pick it up? That can make a huge difference. If he's picking them and they die... it's either a system problem in the store, or the owner doesn't know how to pick them. If it's not the system or the owner, then you need a new supplier.
Every store should have a hospital/treatment system for the sick and injured. Ideally in a back room or other quiet place where the fish can rest and recuperate without kids banging on the glass or without being picked at by other fishes.
The biggest problems we find with angels, no matter what the supplier, is flukes. Copper doesn't get them but a freshwater dip a day for a few days knocks them out quickly and relatively painlessly. Not treating the fish will die eventually - most likely from suffocation as the flukes infest the mouth and gills and eyes -- soft tissues.
If you are losing inverts there is something seriously wrong. Snails can be a bit sensitive but crabs are bulletproof, and stars and urchins are fine IF they are acclimated properly. If not, they can melt down... but that's easy to do properly and losses there should be slim to none.
Of course a lot also depends on what is being brought in too...
Coral beauties are tough -- Rock beauties are not. My lower losses are most likely partly due to the choices I make. I don't bring in obligate feeders like cleaner wrasses and moorish idols. Heck I don't even carry mandarin dragonets (I can bring one in for a hobbyist with an appropriate tank...). My choices are generally hardy, small, colourful fishes, gobies, blennies, hardy angels, hardy tangs... the occasional predator - but most of my customers are reefkeepers so the predators are almost more for show - they aren't fast movers. People want fish that will get along and thrive -- and that's what I try to bring in.
Comparing my mortality numbers with somebody who brings in delicate fishes and may not necessarily know how to care for them is like comparing apples to bowling balls. A few weeks ago I went to the full-line shop in town, and they had a moorish idol (painfully thin) and a bunch of sickly looking butterflies... painful... Betcha my bottom line runs circles around theirs...
I have to concur with Steve -- we do squeak. Every dime is important. The most expensive fish is a dead fish -- yes there are some bad business people out there, who through ignorance, are wasteful of life and of resources... but typically they don't survive long.
If the problem can be appropriately pinned on the wholesaler, find another wholesaler. There should be no such thing as a "bad shipment". I've had losses of all or most of one specie in a shipment, and I notify my supplier and it's usually made right on the next order and they do what they need to do to correct the problem at their end or their supply end.
I did get one "bad batch" once... we got an extra dose of Vibrio.
When it was all said and done I had 16 fish left. Happened early on and luckily our store wasn't fully stocked yet... but we have the ability to nip something like that in the bud now. That's a risk of bringing in wild caught animals - pathogens that can be devastating. But that was the exception, not the rule.
Jenn