They are hidden inside the application "bundle" or "package". Basically, an OS X application is really a disguised folder. Searches do not go into these packages.
Control-click on the dom2 application and choose "show package contents". Then navigate Contents-->Resources-->maps.
BTW, for any Mac folks who read this thread, dom2.16 works fine for me (so far) in OS X 10.4 (on a 400Mhz G3, 384Mb iMac).
I would recommand putting the map folder in the doc or creating an alias, as it is realy tedious to search in the package every time you want install a new map.
2.16 doesn't work right for me at least two times now the shortcuts didn't function (i, e, r,d or x won't do anything) I'm on a 1.8G5 iMac with Mac OS X 10.3.8.
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Algebraic geometry seems to have acquired the reputation of being esoteric, exclusive, and very abstract, with adherents who are secretly plotting to take over all the rest of mathematics. In one respect this Last point is accurate. --David Mumford