Wheatley boxes...
I have a large number of Wheatley boxes for the collection of over 40 hundred salmon and steelhead flies. All of mine are swing leaf boxes with rows of clips. The boxes come in two sizes, smaller one is code 14, larger is 16. The clips for the big flies come in big 7s, a combination of big 7s and 5s, and 5s. A smaller swing leaf box with big 7s is a 1422, with a mix of 7s and 5s is a 1432, and a box with 5s is a 1442. A large box with 5s is a 1642. Some of the swing leaf models are available with a deeper box (1.5"), so a large deep box with 5s is a 1642/1.5. All of mine are equipped with 5s, holding 80 flies when full. Sound like you might like a smaller clip box with a mix of 7s and 5s, a 1432. I have tried and subsequently given away boxes with foam inserts, foam strips, magnetic bars and long coil springs. The clips work best for my flies, sized from 4/0 down to 6.