What dead giveaways scream 'avoid this vendor'?

for me it's 3 things,

-no coa attached or 'available upon request' nah bro just post it.

-vendor pics that look straight from google or stock photo quality, real flower looks messy not perfect.

-sketchy payment methods only, like zelle/venmo 'friends & fam' with no backup.

i got burned once sending money to a too good to be true deal and yeah, it was. these days i just skim we know flower to see if anyone actually got their package before i risk cash.