Haven't met a Home depo/lowes expert yet in any thing that grows they sell.
I'm a part time grower of shrubs and tress etc. The biggest thing I find in planting problems is the "shock" of the plant from Nursery/shade to sun.
Box woods area a very slow growing plant. Hence the cost in size difference. They recover slowly from shock.
Miracle Grow liquid fertilizers can burn shrub roots. A time release fertilizer is always better.
I think they are going through a "shock" period.
Too much sun at once after they were uncovered.
Too much fertilizer mixes here/root schock
Too much water also..
In all plantings of shrubs its "First year sleep / Second year creep / Third year leap."
How was the root system when you planted them?
Back off on the watering. Soak every two to three days. Depending on the soil drainage there.They are drowning, that's why they leaves have no color and are soft not to mention all the chemicals in the planting soil. Water keeps that to active
Re shade the poor ones... Put it back in nursery mode. Let them acclimate to new soil then uncover slowly
One of the nursery modes for many shrubs/boxwoods is they set the pots on black plastic and then for 1 hour a day then get water the whole hour "Big rain" The sun heats up pot for root growth and water quenches the thirst.