Nice score

Welcome to the wonderful world of tube hoarders

So did you pick up a tube tester at the same time? That or maybe a decent vacuum tube volt meter?
Oh, most of the old service guys stuffed their old tubes taken out of sets under repair into the new tubes box. They may or may not have tested the tubes, keeping those that were marginal or better. If it were me, I'd test each of them just to make sure. Better safe than sorry.