Include a bill of sale and state it is being returned to be repaired.UOS will still cahrge you a fee.If you sent it USPS you would avoid this problem.
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The United States Postal Service has a 66lb weight limit. As long as you are at or under that weight you should be fine.
Two years ago I shipped a 66lb amp to the west coast of Canada via USPS. It arrived in very fine shape. It was about 15 years old. The buyer and I expected none of the old brittle backlight bulbs to work when he received it. All but one survived the trip. Don't hesitate to use the Post Office. They could use the business.