Hi Zeph,
Trapping:
You just keep trapping till you have the family primary individuals (or your neighbor runs out of "munks.")
Enclosure:
There "cage" shouldn't be one to them. One of the very human things to do to animals (many animal right's folks do this) is
project "human sensibilities" onto animals.) What we see as a "cage" they may well see as a safe place to live (if we done thing correctly.) I used to keep and breed flying squirrels...wonderful creatures I might add. When I was to my 2nd year, I had (I was in high school) moved on to other species...THEY did not leave their "enclosure" and continued to return each evening to the porch and there little box. Ended up with chipmunks "mugging you" (and your pockets) by day...and flying squirrels doing the same at night...drove my poor mother crazy, but was the delight to visitors (until a "nip" would send the weaker of them into safer quarters.) I like keeping them outside so they don't lose acclimation, and there circadian rhythms are not changed. Further advice (perhaps not all good) can be found on the web...
here is but one example. Another place to get them perhaps is from a "wildlife rehab center." They often are looking for placements of animals or safe habitats.
Let us know how it goes...
I must add this disclaimer...wild munks bite!!...it may be illegal to trap and maintain even for a short time; check with
local authorities...they do have
fleas and ticks on them, and have been know to carry rabies...So..the risk is yours...enjoy.