Excellent finds! That's my main target here in AZ.... 1860's to 80's military encampment's. Get back and hit it hard, I've returned to spots that I was sure wouldn't give up anything else, and then up pops a real keeper. Last week it was an unfired 44 Colt round, which was only made for the 1871 conversions of the 1860 revolver and an unfired 50-70 govt. I hit that place at least twice before.
last year, I hit a spot that ended up producing 14 general service buttons total, on 5 different trips! So get back there and plan on spending a long day.