Oh, well. You forgot to mention these were Mormon bottles. Those don't last nearly as long as regular soda bottles .... just kidding.
If you put certain chemicals in plastic bottles, it can cause them to break down, so if your neighbors eg sterilized the bottles with bleach before refilling with water, that might contribute to breakdown. Certain organic compounds can also attack various plastics. Lead shot, or any other solid, does not react as easily as a liquid phase chemical will, so I would expect your issue is less difficult.
Also, you failed to mention liquid tight as a success criteria. The plastic cap might well exhibit creep with time, to the point where it will not form a liquid tight seal that could drip. But that is not the same thing as failing to the point of spilling shot.
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