From the DHHS regulations:

Substituted Specimens

The HHS criteria for identifying substituted specimens are based on the physiological ranges for creatinine concentration and specific gravity value of normal human urine.


A laboratory will report a urine specimen as substituted when both the initial and confirmatory tests (i.e., tests on separate aliquots) document that:

- The creatinine concentration is less than 2 mg/dL, and
- The specific gravity is less than or equal to 1.0010 or greater than or equal to 1.0200


Source: Drug Testing: HHS MRO Manual (Effective November 1, 2004)
As long as the batch is unexpired (which in this case it is) and had been stored properly (ie; no exposure to direct sunlight), you have nothing to worry about.
Burnt Toast Reviewed by Burnt Toast on . Just took test - noticed something on my laboratory form I just got done taking a urine test for a pre-employment drug screening. I hadn't smoked in two weeks, but wanted to be sure that I wouldn't fail. I ordered Quick Fix, Batch F2D-11, from 513 Ventures (I had bought it in the past, but never had to use it) and followed the directions to a T. I went in, "peed," and came back out. On the laboratory form, the collector marked off that the specimen was indeed between the temperature of 90-100 and had no negative notes regarding my test. We even had Rating: 5