I would suggest treating coins from this company identically to any other raw coin. Numismatic Investments of New England started business in 1982 under that name. It was listed in the Inc 500 in 1988 and continued until 1990 when it changed its name to Numismatic Investments of America. That company filed for bankruptcy in 2001, leaving investors with losses running at least into the hundreds of thousands of dollars. Several messy lawsuits followed. So part of the reason the coins weren't in slabs may have simply been because they were sold by the company before slabbing became the norm. (Accugrade claims to have started slabbing coins in 1984, and PCGS came along in 1986). I have no experience with the coins themselves, but "investment coins" of the 1982-1990 boom varied widely in actual quality, which is part of the reason PCGS was founded. "Investors" were typically promised Gem Quality coins, but often weren't educated collectors. According to the testimony from one of those lawsuits, "45,000 coins were sold with a value of over $46,000,000 to 4,000 clients." So call it an average price of $1000 in 1980's dollars. A '29-S half and an 1885 proof quarter each make sense in that range, a 1930 SLQ would have likely been towards the lower end of what they sold unless it was a "Superb Gem."