"unsubscribe" (JMP) works great!
Well, that product is being discontinued. Turns out that with NL's inventory, it's possible to just take the fresh newspapers, stuff them into your inventory, and when you've acquired 3 in this manner, take them out and bury them as before. Now they will neither expire nor will anyone desire to throw them away, and you'll have 3 current newspapers forever.
It completely eliminates the need for this hack, so we're discontinuing the product in all post-NL games.