If Colt can't ID them SOMETHING ain't kosher.
Did you get any paperwork or outer box with info on them like serial number or model numbers?
What does the auctioneer know about them?
In other words is there any provenance about the gun's past. Where they came from, who had them?
Is it possible you have a "broken" set".
In other words, someone had two sets of guns, put the two .45's in one box, and the two .22's in another, then sold them.
Colt keeps very good records on guns so I'm surprised they can't ID them.
Have you just been talking to them, or have you paid the $100. for the Colt Historical Letter?
When you pay the money, Colt does a FULL search and tells you everything they know about the guns.
Another possible source of info is Cherry's, who are THE non-Colt experts on Commemorative guns:
www.cherrys.com/