You made some of the common mistakes at transplanting, but I doubt if
they were fatal. Don't dig up the trees now, unless they are planted
very deep. Being planted too deeply is one of the biggest causes of
transplant failure. Often, nursery-grown trees get planted deeper and
deeper each time they are repotted. If you dug a too-deep hole, you
could have trees that will struggle and die within a few years. You
can easily evaluate the situation by gently scraping back the soil at
the base of the trunk till you see root flares. If these flares are
lower than the surrounding lawn, dig up the tree and plant it higher
(try to remove the added fertilizer while you are at it). Fill the
hole with the native soil that came out of it, not topsoil or other
amended soil. Planting a little too high is better than too low.
Once you have the proper depth, add a 3"-thick layer of wood chips or
other organic mulch to the area around the tree (but still don't pile
against the trunk--those root flares should be visible and able to
breathe).

Before you plant the cypress trees, review the following:
http://www.isa-arbor.com/consumer/planting.html

This link will explain the full process of proper tree planting so you
can get it right the first time.

Good luck,

Keith Babberney
ISA Certified Arborist
For more info about the International Society of Arboriculture, please visit http://www2.champaign.isa-arbor.com/.
For consumer info about tree care, visit http://www2.champaign.isa-arbor.com/.../consumer.html