The largest denomination in US circulation is the $100 bill
A $100 bill is .0043 inches thick (.10922 mm), 6 inches wide (152.4 mm) and 2.5 inches tall (63.5 mm)
So the volume of one bill is (.0043) (6) (2.5) = .0645 in^3
And we need 10000 of these to make a million dollars
So....the volume of 10000 of these is of these is (10^4)(.0645) = 645 in^3
And the volume of your briefcase is (17)(12)(3.5) = 714 in^3
So.....you could (theoretically) fit all the money in your case
I leave the layout to you....!!!!!