IMO, that case looks to be wrong in several ways: It's too "new", the loading tool is wrong, the powder flask looks to be a modern one that's has it's copper finish completely chemically removed rather than partially removed as usual from use, and IMO the interior is the wrong pattern.
Here's what a real ones look like:
http://www.rockislandauction.com/viewitem/aid/57/lid/1243
and
http://collectorebooks.com/gregg01/coltrevolver/Lot-511.htm
For comparison with the gun in your estate sale, here's a certified museum gennie: (Please note the stamping in the cylinder fluting)
http://www.nramuseum.org/the-museum...-pistols/colt-model-1862-police-revolver.aspx
Here's what a cased Uberti (copy) 1862 looks like, including a different-colored case similar to the estate sale case:
http://www.gunauction.com/buy/7005165/uberti-1862-colt-police-revolver-percussion-cased
IMO, if it's a genuine Colt, it's a hard-pressed specimen that someone found, put together with whatever to "make" a cased example and fooled around with the finish on the accessories and maybe the revolver - all in an attempt to raise the value.
It could be that whomever passed it into the estate got taken; or the heirs don't know what they're looking at, and presume it to be worth 50% of the ones I've linked above for reference.
IDK if your BF would want it, but I wouldn't pay more than $1K for it, and only that if it is indeed a gennie.
My opinion, of course, is worth exactly what you've paid for it...............
.