Sarah, do yourself an eternal favor and burn that script. Call the doctor--have them call in the flexeril. Do NOT burn your bridges in town. I think the pharmacies are knuckling under to DEA pressure and chain competition as well--it is so tempting to know you will have that cushion, I know boy do I know---but in-town pharmacies have always had someone from Law Enforcement who comes around and checks the signatures and scripts.

Alexander King wrote about this really eloquently in two books back in the mid ???50s early 60s.

"May This House Be Safe From Tigers"
"Mine Enemy Grows Older"

He was a wonderful artist/writer/rascal who suffered terribly from kidney stones. One day, when he was in particular agony, an intern taught him the trick of dissolving his morphine and shooting it up, so it would work faster. Unfortunately, it really did, and he became a 'shopper' and had multiple scrips all over town, and knew all the 'scrip' doctors.
He gives many funny/sad stories of waiting as unnoticeably as possible for his order to be filled while pretending it was just one of many things he had come in to the drugstore to get.
As a result, his flat was filled with packages of things he never used, including feminine products, in hopes the pharmacists would see him as a man with a busy life and a wife.
Well, I have never forgotten his accounts of when the Narcotics agents would catch up with him occasionally; eventually his signature would show up at enough places around say a hundred mile radius that it would stick out and so they would arrest him. Yes, this story is true. This was a wonderful man. He 'kicked' voluntarily and involuntarily many times; I forget what his ending was.
Certainly today more options would be open to him.

Anyway, I don't want to freak anyone out, including myself. But just going to a mom and pop pharmacy may not be safe in this instance and I certainly would not take it to a chain.
Call your doc, or better yet, write a short, to the point note, walk away from it for 20 minutes, and review it. If you feel it states your case properly, staple it to a 99 cent Thank You card and leave it at the office on a day you know the doc is there.
I really understand this temptation and wish I could tell you differently.

P.S. Does everyone know that when you register online for the big chains for refills of whatever, that is a fairly large database?
Look at the bottom of the registration for say, Rite-Aid. Online they work thru Drugstore.com.

Just fighting the useless fight with the database monster.