Those 5 days was spend in transit or almost 5.The test was ordered 5 days before the sample was received. Most likely it was held in optimal conditions too. Do you want to tell me sources here actually stock the liquid hGH in optimal conditions and the delivery is done using refrigerated vans?
Let's say 3 days the sample was in transit until arrived to be tested. In transit was warm as is September. If it's degrades in 6 days to half in 3 it should have been under 80% at least.
A clear answer it can't be said.