The kepi is post war, keep in mind that the majority of kepi's produced in the 1800's were for GAR purposes and not necessarily military in nature. The post war army was fairly small, so when you compare the ACW veterans in the GAR you come up with over 2 million. Using very loose math we could estimate that half of those purchased kepis, some both kepi and slouch, with the balance slouch.
ACW kepis were not an issue item, but a private purchase and tend to have a longer bill and thinner, than their post war brethren, a dark brown or black sweatband, 2" to 3" brim to crown height (taller the better) and very fine broadcloth material.
There is a very good article in North South Trader written by Dr. Michael McDonnell (IIRC) explaining the differences. The cavalry insignia appears to be a Bannerman restrike for mounting on GAR headgear, again war date pieces tend towards the loop attachments.
Keep in mind that there are few absolutes in collecting and always exceptions, but you never want to buy based upon those exceptions, unless there is a bonafide provenance. All in all you have a great lot, that quite possibly, be the wartime mixed with postwar memorabilia.
It is very common for a trunk to be opened and find war date and post war pieces, family members of the soldier would not know the difference upon the soldier's passing and put all together in storage and label "Grandfather Pat's Civil War effects"
Overall a great collection of artifacts!