The problem is I don't know what I paid for them originally - it was 30 years ago! But I bought them at Macys, and remember they seemed super expensive at the time. Insurance is supposed to replace with NEW, not used.What is the fight about? What did they sell for new? What would that be in today's dollars?
I found a bunch for sale on Ebay. You might find yours there if the thief is selling them.
Since knives do not appear to be collectible or unique in any way, "comparables" could any knives of similar cost sold at any store like Target etc. From the offerings that I have seen online through Amazon, Ebay, & Sam's Club, it would appear the entire set may be worth about $50-$60 (US).
Agree with sg, these are not expensive knives, though they likely sold for more than the typical cheap knives of the time. They are practically identical to Chicago cutlery stainless knives, a similar set of which would probably be around $50-60. It's surprising that a thief would waste the precious little time on them that they typically give themselves to get into and out of a house, so I'm guessing these were novice thieves.
These were made by the Imperial knife company, of Rhode Island and various other locations. I have an 8 or so inch slicer from their "Very Very Sharp" series. Much thinner blade than the MO series, and nicely hollow ground and polished (though still just stamped out crappy cheap 420 stainless), with stabilized rosewood handle. Again, not really what you'd call an "expensive" knife, but still costing more than the typical kitchen knife of the day of lesser fit and finish quality.