It's probably still just as potent as it was when it was first manufactured. The cool dark environment and lack of air kept it well preserved.
I was cleaning out my Grandma's house after her death and came across a cigar box full of benzos. They were quite old ( back when they dispensed in small brown glass bottles ) and I thought the bottles were cooler than the drugs in them. I sampled the librium, valium and one other I forgot the name and they were regular potency. The cigar box was in a cool dark closet on the top shelf and were good to go.
Heat, direct sunlight and humidity are the biggest things that will degrade the drugs.
Go easy with them as you have no tolerance. Glad you are out of custody and welcome to Bluelight.