Frederick dollar patterns, lots of NCS slabs

One of the interesting consignments to Central States is the Frank Fredericks collection of pattern dollars. Does anyone know its history? Almost half are NCS slabs (improper cleaning) and I assume were sent there for accurate auction representation. Still, some great coins -- I'd proudly own the improperly cleaned 1839 Gobrecht dollar restrike! They say he pursued patterns in the 1970s thru the 90s, do you think he cleaned these himself or are they commonly found that way?
Paul <> altered surfaces <> CoinGallery.org
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I'd guess that 10-15% of the patterns in existence are low grade and/or badly cleaned.
I'd be very surprised if this collector cleaned these coins himself. He was probably just a "price-sensitive" buyer who wouldn't pay for nicer quality coins. He'll probably do well on the collection - patterns are hot - but he could have done so much better if he had bought better quality.
Doggedly collecting coins of the Central American Republic.
Visit the Society of US Pattern Collectors at USPatterns.com.
I was a bit surprised at the large fraction of these coins that are improperly cleaned. Personally, I would rather have 1 very nice coin that 3 so-so coins. It's amusing/interesting that Heritage didn't mention anything about the fact that much of the collection had been improperly cleaned.
Mark