Do not take anything outside of cash for any transaction done with someone you do not trust.
Certified Cheques and Drafts can be forged as well. They are created to be more secure, but in the end, they are still just a piece of paper. You're still gambling by accepting them.
If the money is in their account, the money should be able to be withdrawn easily.
You can also provide the buyer with a reciept. Anything that proves that they spent the money, and on what should suffice for whatever paperwork they will need.
Do not accept anything outside of cash.
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