I too think that the OP made some mistakes.
Some obvious ones, like keeping valuables and a lap top away from their immediate control and maybe some based on the lack of knowledge about this country (which you can't expect every tourist to have). But everyone makes errors now and then. And everyone can become a name in the statistic of robbed tourist in this and other countries, even those who have taken all possible precautions and know the country inside out.
I thus empathize with the OP and also think that it is a poor answer to immediately wave the "it can happen in America too" card at these, after all, victims of a crime.
There is one thing however which attracted my attention in the OP:
... When the bus stopped at the first stop in Santiago, my husband went down to the baggage bin to get our water bottle. My luggage had been moved to the first compartment where NO other luggage was. .
I have NEVER experienced that in either, Caribe Tours nor Metro!
Why was that piece of luggage treated so differently than everybody else's and by whom? The OP's certainly weren't the only ones traveling to Santo Domingo (final destination of the bus) with luggage?!?!
Usually, bags are stored in compartments/bays by destination only (to prevent mixups)
QUESTIONS:
- Did the bus stop in La Vega (just of the highway 20 minutes after the second Santiago stop)? Could it have been taken there?
- At least Metro usually has this policy to make sure, that EVERYBODY is OFF the bus before they open the cargo doors, so everybody can witness the hand out of the luggage. I haven't been on CaribeTours for a long time... don't they wait until everybody is off before the allow people to grab bags? Aren't they supposed to?
I think that the only chance to see some of your luggage re-appear is, if the case could be made obvious to the owners of the company, that some standard procedures had been altered in such a way which would raise suspicions about a direct involvement of the driver himself (which, while the luggage apparently having being singled out, certainly triggered my attention, I am not implying explicitly here). Once the owners, who will btw. never accept any fault by the company or their employees, could recognize an obvious pattern, they may put some pressure on whom ever they feel could be the culprit and then, come back and proudly announce that they heroically "found" the lost piece. Unlikely, but a small chance.
Suing? Forget about it! Since you are probably not legal residents, suing, while a legally available option, is made difficult to you by requiring non residents to leave a hefty deposit (prepay) before being able to only file a suit.
... J-D.