Tubes sound like a broken lightbulb

I don't believe any tube, nos or new should sound like anything when you handle them. I would think a call to the store is in order... 

When i was shopped for some rare NOS i was looking for matched pairs or quads, tested by the seller on professional tube tester and by ears too. Blind deal is risky, i hope you can return for refund or replacement.  

I have noticed a few adds lately as I have been shopping for some tubes like yours that a seller or two has mentioned in the add that the tube had the same issue as you have with yours and that it was not an issue with its performance. I did pass on these, so don't know if there was an issue or not and appreciated knowing the fact before hand. 

Depends upon how hard you shook them to elicit the sound you hear.  Don't forget those octal triodes have a large glass envelope with substantial metal and mica structures inside.  I do believe that if you shake such tubes GENTLY, you might hear that sound.  And I also believe that if you shake them vigorously, there is a good chance you could cause the damage that would lead to that sound of a broken light bulb.  So, if you can honestly say you didn't shake them vigorously, why not give the tubes a chance to see if they work OK?  You might be fine.