Agreed about Lowe’s, it is our store of choice. When I was working full time there was never any question about buying the most appropriate tool to fit our needs from the store that demonstrated values that we agreed with. Now that I am a stay at home mom we have had to make some compromises here and there that we previously would not have.
I thank you for your service. :)
Otherwise, you might consider renting a flatbed trailer and hiring someone with a forklift to load the shed intact to return it back to Home Depot and get your money back. I live in the rural area and people haul large items and heavy equipment around here all the time. My wife's cousin just bought a prebuilt metal shed and picked it up himself with a flat-bed trailer pulled by his pick-up. The place he bought it from loaded it with a fork-lift and he unloaded it with ramps and a winch.
Good luck resolving your problem.