Welcome to the forum. There have been many times on WTB ads that scammers will send you a PM. 1st check how many posts the member has sending the PM, 2nd notice if they suggest a 3rd party sale that has a weird sounding email or they are trying to move the sale off the forum. If you see 1-3 steps, chances are they should not be trusted. 3rd party sales are not prohibited. You need to ask for pics of the parts, if you get the pics, do a simple google search for the particual part and chances are you find the photo they sent you copied and pasted. If they do come throught pic, next ask to see the pictures again with a member name & date in each photo. The photos with name & date cards are required for any part over $100.
If you get these type of PM's please send me a PM with the member's name. DO not inform me publically of a PM sent, just send it. and copy and paste the pics attatched to the PM. Remember scammers typically have an excuse why they can't send the pics, then just say when you get to your parts take the pics. and send them. If they do not insert a name & date card in the pics, ask to see pics with the name & date card.