Do they come apart to allow for re-packing? If so, you should have a look inside. They may have forgotten to pack your ones or only packed very lightly. If they were closing down they may have got less diligent on quality control. Get some more muffler fibreglass or SS wool from a muffler shop and pack more in. Note: don't use domestic fibreglass or SS wool - they aren't designed to handle the temperatures.

Cheers, Richard
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09 America, Staintune Pipes, K&N, Breathe, Hagon Nitros, AI & O2 removed, tune 20184 (modified), MTX-L a/f gauge