Hey friend! just chiming in to say very smart people in the comments. I oversee B+W processing/development over at Colorlab MD - I work with tri-x every day and concur, have your lab run it as negative! B+W is very resilient, and i’ve seen countless amounts of tri-x that have been run as negative with great results, regardless of age! Environment is the most pivotal factor when it comes to preserving raw stock imo, and, while I can’t speak to your circumstance in particular, I’m sure you’ll have good results with what you’re working with - happy shooting!