How to not get scammed?

Hi, I am buying a high value Pokémon card from a new seller with a trustee service and I want to ask what precautions should I take to not get scammed?

The seller sent multiple photos including one with his nickname and current time, but I have a weird feeling as the seller communicates quite unprofessionaly, reached me through the phone I submitted as a part of the shipping info to ask about a courier and sounded confused about what card I ordered. Furthermore, the seller used masculinum twice in the chat even though the profile is in a female name and upon investigating of the phone number I found a comment noting that the caller scammed someone, who paid for the goods that never arrived and than stopped communicating.

The seller haven’t shipped my order yet and maybe I am being too paranoid, but I am worried that he will either ship an empty box, or claim it was stolen during shipping. I know I should document everything when it arrives, including taking pictures and videos of the unboxing, but is there anything else you would recommend? Or should I just try to cancel the order?