How awesome! Hopeful there will be more late arrivals for you.
I didn't realize all 60 were from the silver collection! Those little guys better get to crackin!
Hoping you get more, but all things considered... 5 is a good start! You could be hatching young from these in 12 weeks...a Beautiful thing about Coturnix :)
Just for perspective... My Gouldian Finches take at least 6 months JUST to get adult plumage....and it takes most pairs a year and a half...
Don't lose hope yet! I've heard of people having them hatch on day 18. If you're a curious/impatient person (like myself haha) Try picking up an egg, give it a VERY light tap, then hold it right up to your ear. By this stage you SHOULD be able to hear the chicks moving in the egg, or even a peep.