I've had the unfortunate displeasure of dealing with buyer, sgm19th-sf.
https://www.ebay.com/fdbk/feedback_profile/sgm19th-sf?mkevt=1&mkpid=0&emsid=e11051.m44.l1183&mkcid=7&ch=osgood&euid=04879214d64f4dba9498adea03f96a95&bu=45161543946&osub=-1%7E1&crd=20240709110424&segname=11051

What a problematic buyer. I did everything right, and he still wanted to make an issue when there wasn't one. He complained that shipping was slow, when he was fully aware of the turnaround and shipping time. He was a jerk from the very beginning. He even resorted to threats. After speaking with other sellers that he's had a run in with, it's painfully obvious that they regularly leave neutral or negative feedback that's unwarranted. Buyers like him make selling on this platform a nightmare. What's worse, is the individual claims to be military. I reported him. Not sure if it will even make a difference. Block him if you value your sanity.