No they do not.
That's just a few of the yearling colts that went unsold.
They will not however let them run loose - the requirements are that they be in a confined area with a 6' fence. they know little to nothing about fences especially wire ones. "facility meets all BLM requirements. Include exact information about the length, width, and height of your corral and shelter, and the type of materials used in the construction. Applications cannot be approved until all construction or modifications are completed. Corrals must be 5 feet high for yearlings, burros, and trained horses, and 6 feet high for untrained horses 2 years and older."
"An outside corral with a minimum of 400 square feet (20x20) per animal. Corral should not be too large (more than 50x50), as animals are easier to gentle in smaller corrals.
All fences and gates must be at least 6 feet high for wild horses over the age of 18 months. Five foot high fences are allowed for gentled horses, yearlings, and burros.
Fencing material should be 2x6 inch wooden planks spaced no more than one foot apart, rounded pipes, poles, or similar materials that do not pose a hazard to the animal. Small mesh, heavy gauge, woven wire fencing with a 2x6 inch board along the top, center and bottom is acceptable. No barb wire, no electric wire, no T-posts. Once gentled, the animals may be maintained in pastures or in box stalls with daily turnout."