I agree that it is a pretty big coincidence, so I've never written it off completely. But I do think it is very unlikely.
I also think the first phone call is to Rao's. They deliver to the dorms if I'm not mistaken. I'm not sure if they did back in 2004, but it seems likely, since she'd be stuck at her desk until her break. Always occurred to me that your coffee cup would be a pretty good place to hide a little booze, especially if you loved Bailey's and Kahlua.
Yes, Rao's is what my research shows as the place she called, however, the brochure I found online that listed the phone number for Rao's (it was an old brochure from around 2004) may have printed the wrong phone number, thus causing me to erroneously attribute Maura's call going to that place.
Long story short, I can't confirm that as a fact, but for those that have never seen it before: here is what my research found for Maura's phone call activity that night:
Maura Murray Cell Phone Calls
Thur Feb 5 ==== (Incoming) --- 7:17 p.m. to 7:37 p.m. (before her shift started)
Thur Feb 5==== (Outgoing) --- Amherst last four 9411 ---- 8:40 p.m. to 8:43 p.m.
Thur Feb 5 ====(Outgoing) --- New City, NY last four 8290 ---- 9:09 p.m.
Thur Feb 5 ====(Outgoing) --- New City, NY last four 8290 ---- 9:55 p.m.
Thur Feb 5 === (Incoming) --------- 9:56 p.m. to 10:02 p.m.
Thur Feb 5 = (Outgoing) --- Hanover, Ma last four 7271 --- 10:10 p.m. to 10:38 p.m.
Fri Feb 6 === (Outgoing) New City, NY last four 8290 12:07 a.m. to 12:14 a.m.
Fri Feb 6 === (Outgoing) Amherst last four 8911 ---- 3:40 a.m. to 3:42 a.m.
Dominos Pizza --- Amherst, Ma (413) 256-8911
Raos Coffee --- Amherst, Ma (413) 253-9411
Hanover, Mass --- Confirmed number of Mauras older sister
West Point is approx. 22 miles from New City, New York. (Either Billy or mauras sister Julie or both could have cell phone plans from this area (that follow them wherever they move). So even if Billy is in Oklahoma any cell phone call he makes to someone else will show up as a new city, Ny number.