They probably aren’t worth it if you don’t already scrap. I would put it on Craigslist or FB marketplace for free or put it on the curb for a few days. Otherwise, steel is about &.05-$.07/lb in most parts. Figure each of those weighs maybe 50lbs x 12 x $.06 = $36. So figure between $25-$40 depending on actual weight and price at the yard. Is it worth your time and gas money. More on reddit.com

100 sure, nowhere near 200 years old. File cabinets are a latter half of the Victorian era thing - 1870+. Just from the look of it I’d say late 1890s to 1910. I’ll come back and add if I find more. Earliest it can possibly be is 1880 when Yawman & Erbe was founded. Latest date I can find for the company is the 1970s, but I think their business must have changed significantly after the 1930s. Here’s a 1909 catalog you can look through: https://archive.org/details/yawman-erbe-filing-cabinets-catalog-915-e-1909/page/n22/mode/1up Further I’m a bit suspicious of those side panels. See page 12 in that catalog above which is your file cabinet. They look to either have been added (they look like early plywood to me which I’ve seen mainly on 1940s/50s things) or this was part of a file bank like the catalog. Your dad got a steal at $75. Office furniture like this tends to hold a pretty good value and I’d expect to see it, if the sides are original or hiding the original, for quite a bit in an antique store. (I had numbers here but realized they might not be accurate.) More on reddit.com