Update: I went in to pick up my resized necklace. Had a very weird experience - I made an appointment and came in. SA asked me for my service order number, then went back to retrieve my necklace.
A different person in the store asked me if I wanted anything while I was waiting for her (the store was completely empty), so I asked for a coffee. She was super nice and complimented my other jewelry/outfit and brought out chocolates with the coffee because “life is better with chocolates”
My SA came out with my necklace on the tray and asked me to sign the receipt. She just stared at me when I asked to try it on to see the new length first (my husband was there so he helped me put it on). I asked if i could get some sort of pouch to take it home (I had on a different necklace at the time) and at first she said no, because the necklace was brought in without any packaging. I asked again, explaining that I wasn’t wearing it out, and she said she would check if they had anything and eventually packed it up in a box (same as the box I got when I first bought the necklace). So long story short, no travel pouch haha