Phone in hand means cash in hand.

it is exit scam season! scammers love fear because its makes suckers out of anybody and even good sellers have been known to run after a big slew of orders. always stick with protocol in times of crisis in this case its escrow and communication.

remember in our world trust no one person even on society or little biggy, even if they have a zillion votes, even if they have shipped to you before, facts and procedure handle 90% of situations, group consensus solves the rest.

verification is our strength - even if you hate post drama your relevant experience should be shared with the rest of us. follow up on your posts are especially valuable to see if your problem was resolved.

always be kind and don't let suspicions get nasty but forgive when they do, people are emotional now.

Lots of apps leave a legacy of activity, clean that shit up!

Open Terminal found in Finder > Applications > Utilities

In Terminal, paste the following: defaults write com.apple.finder AppleShowAllFiles YES.

Press return. If theres no error you are done with the terminal now.

Hold the 'Option/alt' key, then right click on Finder in the dock and click Relaunch.

Voila

There is a library directory for the mac itself and your user.

Now check the subfolders for application remains and delete. Here is list of the most common relevantt directories.
~Library > Application Support
~Library > Caches
~Library > Logs
~Library > Preferences
~Library > Containers
~Library > Cookies

Bitcoin can be a pain in the arse. I trust my seller so why not just send them the money?