I tend to abide by the old rule, "when in doubt, throw it out."
I tossed a whole rack of spares recently after thawing in a 35° fridge for two days because the cheap cryo pack they were in had come open on one end. I found a puddle of liquid in the bottom of the fridge and traced it back to the one rib pack that had leaked. After I rinsed them off and they still smelled bad, I saw some dark spots on the meaty side. This caused me to toss them and get another slab to cook.
Traeger Lil' Tex Elite, WSM, Green SS Performer, 22" OTG, hyperfast orange Thermapen. CBJ.