Sure. The last one was Cajun Guns, who specializes in CZ. He sent me the label but I didn't use it. I seem to recall the Bruce Gray does too, but his lines are busy over the holidays and I can't check it. Others are lost in the past, sorry.Can you share what courier's labels were provided to you by your gunsmiths?
If you plan to ship and don't at least check for a mailing label you're potentially leaving money on the table.
Edited to add: One definitely was Ultralight Arms when one of Mel Forbes' triggers developed an issue. Not only did he provide the shipping label, he scheduled the Fed-Ex pickup. It was kind of funny - the Fed-Ex guy got to my house before Forbes' warning, so I had to give the guy ice tea while he waited for me to finish packing it.