Since you were asked to ship UPS Ground, some advice:
UPS will rate based on weight or size (if it's bigger than what they think the weight should be for that size box).
You should not use a padded/bubble mailer for UPS Ground. It will get destroyed.
Expect the box to be drop-kicked atr some poiint along it's transit. Pack the stuff so it CANNOT move inside.
Double boxing would be HIGHLY recommended.
Disclaimer - I worked for UPS for 18 years (IT dept, 1998-2016). But I shipped enough and received enough. I could NEVER save a box of mailer that I got when it was shipped via UPS. Don't even think to mark fragile on the box. Extra incentive for them to kick it around.
-- Dan --
Note: Please see my profile for more info regarding trading (section updated 3/4/2024). I have added a large portion of my inventory to the site, and currently have trading turned on (details are in my profile).