Iron Fish

We've noticed Flocculation in some of our products in the past. In your experience does the borosilicate fiber filter have much effect on flavor and mouth feel? 

Our previous Head Distiller has kept a library of samples from each of our bottlings in case the TTB needs to test a specific batch. These bottles are kept in a locked cabinet in the production office, but they do not exist in our inventory or computer system. With a TTB inspection approaching, we are becoming worried that these samples we thought we were saving for the TTB may actually be in violation of the rules themselves. 

Can anyone advise me on the legality of this? do we need to have samples of all our distribution batches? If so, do we have to keep them in our computer inventory and pay taxes on them?

Thanks for any knowledge you can provide.