I always assume the "I got busted" posts are fake, but in light of the PurpleLab drama I thought I should post this warning.
DO NOT POST ABOUT YOUR ARREST. If you post any details about the bust, your post WILL be linked to you. If you post a vague, seemingly harmless post a month after your arrest, it WILL still be linked to you. This is particularly bad if you've made incriminating posts in the past (which the cops WILL see), but even a single post in this sub with a throwaway account will still look bad and can still be relevant at times during the judicial process, even if it's not used as evidence to convict you.
If you ever get arrested, (a) say nothing till you have a lawyer and (b) talk to your lawyer before making ANY public statements about your case, even statements you are confident will not be traced back to you.
Finally, I do understand the desire to warn others. If you're truly concerned about that and feel you have to do something, maybe ask someone you trust to post a generic "I heard someone got busted after ordering from X" thread. Sure it will look like FUD, but so will your detail-filled post. There's really not much you can do other than protect yourself.
Be safe!
EDIT: For everyone else, please take a minute to look over your commenting history to decide if you're being too candid. Even with perfect opsec you can still get unlucky, and if that happens there's a chance that any non-tor activity here can be linked to you.
Important question: Are you fucking nuts?
It is extremely valuable to have others in the community know that a vendor has been profiled and people are getting arrested. That is literally your only chance to get a warning about a possible CD coming your way.
Name one case you know of where a post after-the-fact on reddit fucked someone who was already arrested. Please.