I totally agree. This is why I'm convinced that person/people responsible have access to a walkin freezer. Take a look at this walkin freezer vendor's website to get an idea on what types of businesses would have one;
Commercial Refigeration.
My gut feeling is that there is a connection to a bait & tackle store or supplier. My next gut feeling is a connection to a party boat or charter boat business (but as you can see on the website, it could be a connection to a grocery store, butcher, bakery, deli, or a larger warehouse establishment.
This would also align with the idea that he is a business owner that can work whatever hours he wants and has few employees if any. Or maybe the employees don't have access to all the walk-ins. I would think the fear of a health inspector showing up for a random inspection might rule out food establishments.
On the other hand the secondary freezers that people sometime keep in their basement might be large enough to fit a petite women.
I like the idea of the large boat coolers, but it seems like it would be pretty risky getting the body from the car to the boat.