I never liked the idea of going back and opening up all of the caches for the teams and inserting new equipment. This in itself is a security nightmare.
I always thought the best was to do a map update for the team in the bolt hole and just mark the old caches as supplementary and give them new primary caches instead
If you want to search for a USGS Benchmark (now managed by the National Geodetic Survey) this interactive map is a nice way to find the benchmarks used :
https://www.ngs.noaa.gov/datasheets/
And some interesting information :
http://gisgeography.com/survey-bench...tion-geocache/