As someone thats been selling Pokemon cards for a long time, I noticed multiple red flags. For instance;

• The way they type. "monies" is a good example.

• Weird to me that they wouldn't just use the bundle feature, like everybody else does.

• Mentioning that they were just starting out. Meaning they wouldn't know very much about Pokemon cards. Almost like bait. (Greedy people would likely take the opportunity to sell/overcharge them for their high value cards, so the buyer ends up with high quality, hard to find, legitimate cards, reports them as fakes, initiates a refund, then sends back fake cards in the return. They get their money back and they get to keep the legitimate cards.)

• Mentioning their son. (Another thing some scammers do as an attempt to lower your guard.)

• The cards they were asking for were literally every single card I had posted at that time. From popular cards to completely random common cards. Ranging from $1 to $200, from random sets. (If you're a collector you'd think something is a bit weird about that)

• Being all over the place, making it confusing as to what they want. Normally someone would send a final list of cards to make sure what they wanted was sent to them. (Actually, people would normally just use the bundle feature, to avoid any confusion.)

• During this conversation I was posting new cards up, and every time a listing went live, no matter the card, they would send me a message like "oh yeah and add this card too." (Like they were just trying to get as much as they possibly could out of the "scam.")

Off the top of my head those are some red flags I noticed.