Document signed by both parties, but they signed two seperate physical copies

It is boilerplate language in almost every contract that the agreement may be signed in counterparts.  Thus, for example, every one of the hundreds of stipulations I draft every year contains a provision to the following effect:  "This Stipulation may be executed in two or more counterparts, one or both of which may be a facsimile or reproduction of a pdf file, each of which shall be deemed an original for all purposes."   If you look at your contract, I bet you will see a similar provision.  If it isn't there, it's still possible that the agreement would be considered valid, but I'm not a Colorado attorney and can't say for sure.