I‘ve bought a couple!! I’m in a few groups on facebook where people buy and sell LV - there are quite a few reputable sellers who buy in bulk from auction houses and sell on through facebook, but I’ve also bought from people selling privately through the groups. I always join a group and then observe for a while to get a feel for who‘s who and how the group works. Usually they have a rule that sellers have to post items on the page and buyers comment first, before moving to DM, and always pay through PayPal. There are a few companies that authenticate bags too (although I’ve heard of them getting it wrong too).
Mine is a bit scratched now, but I pointed it out to my friend recently and she said she wouldn’t have noticed. Mulberry will replace the plate if it gets scratched, for about £50 I think.